The 2026 Dental Billing Guide: Claims, CDT Coding, Denials, and the New CMS Rules

Dental billing got harder in 2026. The ADA's Current Dental Terminology (CDT) 2026 code set brought 60 changes on January 1, 2026, and the ADA has announced 67 more for CDT 2027. CMS also set May 26, 2028, as the compliance date for electronic claim attachment standards.

Dental billing follows the same eight steps whether you own the practice, manage the front office, or run revenue for a dental service organization (DSO). Our team at iDental Billing works these claims every day, and we've checked each rule below against ADA, CMS, and other primary sources.

Key takeaways

• Dental billing runs in eight steps, from insurance capture to the patient's final statement.
• Under HIPAA, the CDT version on a claim must match the date of service.
• Eligibility, frequency, and coordination of benefits errors start at the front desk, where your team can catch them during verification.
• Since July 1, 2025, CMS has required the KX modifier and an ICD-10 code on Medicare-covered dental claims.
• Covered entities that exchange claim attachments electronically must use the new HIPAA standards by May 26, 2028.

What Is Dental Billing?

Dental billing is the process a dental practice uses to get paid for treatment. It covers verifying insurance, coding procedures with CDT codes, submitting claims to dental or medical payers, posting payments, appealing denials, and collecting the patient's share until the balance reaches zero.

Two revenue streams feed a dental practice: insurance claims and patient balances. Your billing team works both, and it depends on clean handoffs from the people who schedule patients, chart treatment, and keep provider enrollment current.

Patients pay a big share of the bill themselves. According to the ADA Health Policy Institute's January 2026 analysis of CMS data, US dental spending reached $189 billion in 2024, or 3.6% of national health spending. Out-of-pocket payments from patients were the largest source of that money, ahead of private dental insurance.

Dental insurance billing vs. patient billing

In dental insurance billing, your team collects from payers: preferred provider organizations (PPOs), dental HMOs (DHMOs), Medicaid, Medicare Advantage dental plans, and medical plans for medically necessary care. Each claim ends in an explanation of benefits (EOB) or an electronic remittance advice (ERA) showing what the payer allowed, paid, and left for the patient.

Patient billing covers what insurance doesn't: deductibles, coinsurance, copays, non-covered services, and self-pay treatment. Say a plan pays 50% of a crown's allowed fee after a $50 deductible. The patient owes the $50 deductible plus 50% of the remaining allowed fee, and your estimate needs both numbers before you seat the crown.

How billing fits inside the dental revenue cycle

Revenue cycle management (RCM) covers the full path from scheduling to reporting, including credentialing and fee schedule upkeep. Billing is the claim-to-cash core inside it. Teams that run full-service dental billing and RCM manage both layers, so they can fix a credentialing gap months before a payer denies a claim over it.

Dental billing vs. medical billing

Dental and medical claims use different code sets, forms, and benefit rules, and a dental office runs into both.

Billing a patient's medical plan from a dental office goes by two names: dental medical billing and cross-coding. It comes up with trauma, sleep apnea appliances, TMD, and some oral surgery, and the special billing situations section shows how the claim changes.

How Dental Billing Works: 8 Steps From Appointment to Payment

The dental billing process runs in eight steps. Your team captures insurance, verifies eligibility and benefits, documents and codes with CDT, and submits the claim. After the payer adjudicates it, you post the payment; work secondary claims, denials, and aging; and bill the patient. Each step has a clear owner, on your team or at the payer.

1. Insurance capture at scheduling: record the subscriber's name, date of birth, member ID, group number, relationship to the patient, and any second plan. (Front desk)
2. Eligibility and benefits verification: confirm coverage 48 to 72 hours before the visit through the payer portal, by phone, or with the HIPAA 270/271 eligibility transaction. (Front desk or verification team)
3. Documentation and CDT coding: chart the tooth, surface, quadrant, findings, radiographs, and perio readings that support each code. (Clinical team and coder)
4. Claim submission: send the ADA Dental Claim Form data as an X12 837D through a clearinghouse, with any required narratives and attachments, and aim for the same or next business day. (Dental biller or billing team)
5. Adjudication: the payer runs its dental claims processing, applying its fee schedule, frequency limits, maximums, and coordination of benefits rules, then returns an EOB or an X12 835 ERA. (Payer)
6. Payment posting and reconciliation: post the payment and contractual write-off by procedure, then match each electronic funds transfer (EFT) deposit to its ERA. (Billing team)
7. Secondary claims, denials, and accounts receivable (AR) follow-up: send the secondary claim with the primary EOB, fix rejections, appeal denials, and work the aging report. (Billing team)
8. Patient billing and collections: send a statement for the remaining balance and check it against the estimate the patient signed. (Front desk or billing team)

Your team closes the dental billing cycle only when the patient balance reaches zero. If you're training someone on how to do dental billing, teach the steps in this order, since each one depends on the step before it. A handoff skipped at step 2 or 3 tends to surface as a denial at step 7.

Dental billing cheat sheet: who owns each step

Steps 4 through 7 usually need the most follow-up time, because your team waits on a payer at each one and has to chase the answer. They're also the steps a dental billing services team can take off your plate.

What Changed in Dental Billing for 2026, and What Starts in 2027

Five changes affect dental billing from 2026 through 2028. The ADA's CDT 2026 code set took effect January 1, 2026, and CDT 2027 follows January 1, 2027. CMS adopted HIPAA standards for electronic claim attachments and finalized a 2027 Payment Notice on adult dental in Marketplace plans. Medicare's KX modifier and ICD-10 rules for covered dental claims stay in force.

Our team checked these rules against ADA and CMS sources on October 3, 2026.

Schedule the CDT 2027 update for the last week of December. In the first week of January, run a handful of your most common claims through the clearinghouse. Confirm they pass its edits before your team bills the full schedule under the new code set.

Who Pays the Claim: Dental Plan Types and the Benefit Rules Behind Every Bill

Dental insurance billing starts with the plan type. PPOs pay per procedure up to a contracted fee, DHMOs pay a monthly capitation, Medicaid pays from a state fee schedule or a managed care plan's rates, and discount plans don't pay claims. The plan type sets what goes on the claim, what you write off, and what the patient owes.

According to ADA Health Policy Institute data published in April 2026, 56% of Americans had private dental coverage in 2023 and 24% had none. The same report found that Medicaid or the Children's Health Insurance Program (CHIP) covered 37.9% of children.

Among adults 65 and older, the report found that 54.7% had no dental coverage when Medicare Advantage dental benefits aren't counted, and 38.0% had none when they are. For billing, that mix matters: pediatric offices handle many Medicaid and CHIP claims, and many older patients pay out of pocket or rely on Medicare Advantage dental benefits.

How each dental plan type is billed

Each plan type pays the practice in its own way, with a billing watch-out for each:

Benefit rules that cause most billing surprises

Seven benefit rules cause most of the surprises our team sees in dental billing:

• Annual maximum: once the patient reaches it, the plan generally pays nothing more that benefit year for services that count toward the maximum.
• Deductible and coinsurance tiers: a common design pays 100% for preventive, 80% for basic, and 50% for major care, but check each plan.
• Frequency limitations: plans allow cleanings, exams, and bitewings a set number of times per benefit period.
• Waiting periods: new enrollees may wait before basic or major coverage starts.
• Missing tooth clause: the plan won't pay to replace a tooth lost before coverage began.
• Alternate benefit (downgrade): the plan pays for a less costly option, such as the amalgam allowance on a posterior composite.
• Age limits: plans often cover sealants and fluoride only up to a set age.

Payers apply these dental insurance billing guidelines at adjudication, after the dentist finishes treatment. Catch them during verification and put them on the patient's estimate, so the patient hears about a downgrade or a spent maximum from you before the EOB arrives.

Steps 1 and 2 in Depth: Insurance Verification and Coordination of Benefits

Verify eligibility and benefits 48 to 72 hours before every visit, then confirm nothing changed at check-in. At this step, your team can catch coverage, frequency, network, and coordination of benefits problems before a payer denies the claim over them. You also get the numbers for an accurate patient estimate before the dentist starts treatment.

What to verify 48 to 72 hours before the visit

Check seven things before the patient sits down:

1. Active coverage on the date of service, with effective and termination dates
2. Subscriber, patient relationship, and dates of birth that match the payer's file
3. Network status of the treating dentist with this payer, since new associates often need provider credentialing
4. Remaining annual maximum, deductible met, and coinsurance by category
5. Last dates for prophylaxis, bitewings, full-mouth series, and scaling and root planing
6. Waiting periods, missing tooth clause, alternate benefits, and age limits
7. Predetermination or pre-authorization requirements for the planned codes

Say a patient books in March, changes jobs in April, and arrives in May on a terminated plan. If your team didn't recheck coverage, the payer denies the claim with claim adjustment reason code (CARC) 27, and you end up billing a patient who wasn't expecting it.

Record verification results in structured benefit fields in your PMS instead of free-text notes. It's one of the first dental insurance billing tips we give new clients, because the claim and the patient estimate then pull the same numbers and nobody retypes a maximum by hand.

Coordination of benefits: which dental plan pays first?

Coordination of benefits (COB) sets which plan pays first when a patient has two. If your team bills the plans in the wrong order, the payer you billed first will often deny the claim with CARC 22. These rules set the usual order:

• The plan covering the patient as an employee pays before the plan covering them as a dependent.
• For a child whose parents are married or living together, the birthday rule in the National Association of Insurance Commissioners (NAIC) Coordination of Benefits Model Regulation makes the plan of the parent whose birthday falls earlier in the calendar year primary. The rule uses month and day, and the parents' ages don't matter.
• If both parents share a birthday, the plan that has covered a parent longer pays first.
• For divorced or separated parents, a court decree that assigns health coverage sets which plan pays first.
• Medicaid is generally the payer of last resort.
• For medically necessary care, such as trauma treatment or a sleep apnea appliance, the medical plan may pay first.
• Self-funded employer plans follow their own plan documents, so confirm the COB order with each plan.

Send the secondary claim with the primary EOB attached. Plans that use non-duplication or carve-out COB can pay less than you expect, or nothing, when the primary plan paid at or above the secondary plan's own benefit level.

Predetermination vs. pre-authorization

You request a predetermination by checking "Request for Predetermination/Preauthorization" in box 1 of the ADA Dental Claim Form. It's a voluntary request for an estimate, and it doesn't guarantee payment, because eligibility and maximums can change before the patient comes back for treatment.

A pre-authorization is a required approval that's common in Medicaid, some DHMOs, and medical plans. Without a required one, the payer will often deny the claim with CARC 197, one of the codes in the denial code table further down.

If your front desk can't keep up with verification once the schedule fills, you'll keep seeing CARC 22, 27, and 197 on your ERAs. iDental Billing's dental insurance verification team can run those checks before each visit and take that work off your staff.

Step 3 in Depth: CDT Codes, ICD-10, and the 2024 ADA Dental Claim Form

You report procedures on every dental claim with CDT codes, which the American Dental Association maintains. The CDT version must match the date of service, and some claims also need ICD-10-CM diagnosis codes, which follow a different update calendar.

CDT codes: the HIPAA standard, updated every January 1

Under 45 CFR 162.1002, the Code on Dental Procedures and Nomenclature is the HIPAA standard code set for dental services. Offices often call it CDT, D-codes, or the ADA dental billing codes. The ADA publishes a new version each year, effective January 1.

Under 45 CFR 162.1000, a claim must use the code set version that was valid on the date of service. Your team codes scaling and root planing (SRP) done on December 30, 2026, from CDT 2026, and the same procedure on January 4, 2027, from CDT 2027, even if both claims leave the office the same week.

The ADA groups CDT into 12 categories by code range:

According to the ADA, CDT 2026 deleted six codes (D1352, D1705, D1706, D1707, D1712, and D9248) and dropped the dentin limit from D2391's descriptor. The update also added codes for point-of-care saliva analysis, cracked tooth testing, occlusal guard cleaning and inspection, and duplicate complete dentures.

The ADA also overhauled the anesthesia codes in CDT 2026. Your team now reports sedation with new codes D9244 through D9247, and general anesthesia with an advanced airway with D9224 and D9225. Check your sedation templates and time documentation against the new descriptors before you bill a 2026 sedation claim.

How dental billing and coding work together

Dental billing and coding are two halves of one job. Your coder turns the chart into CDT, plus ICD-10 when a payer requires it, and your biller gets that code paid. A payer will still deny a correct code on a thin chart, so both halves have to agree before the claim leaves.

Scaling and root planing shows the overlap. D4341 covers four or more teeth per quadrant, and D4342 covers one to three, so the chart must show which teeth qualify. Your biller then attaches the perio chart and radiographs and checks the payer's SRP frequency limit.

What does a 4 mean at the dentist? On a periodontal chart, a 4 means the clinician measured a 4 mm probing depth at that site. Payer SRP policies weigh charted pocket depths and radiographic bone loss, and each payer sets its own threshold for D4341 or D4342.

Watch three codes that offices mix up: D1110 for adult prophylaxis, D4346 for scaling in the presence of generalized moderate or severe gingival inflammation, and D4910 for periodontal maintenance after active therapy. A coder separates them with the dental billing guidelines that apply here: CDT descriptors, the ADA's claim form instructions, and each payer's policies.

When does a dental claim need an ICD-10 code?

Many routine dental claims go out without a diagnosis code, but three situations call for one. According to CMS, Medicare-covered dental services have needed an ICD-10 code on the dental claim since July 1, 2025. Every medical claim needs one, and some dental payers ask for diagnosis codes on certain procedures.

According to the ADA's 2024 claim form instructions, box 34 carries the code list qualifier "AB" for ICD-10-CM, box 34a holds up to four diagnosis codes, and box 29a points each procedure line to its diagnosis. Your coder fills all three whenever a payer requires a diagnosis.

ICD-10-CM runs on a different calendar from CDT, so your dental billing team has two update dates to track. The diagnosis code set updates every October 1, and CMS can add an April 1 update, as it did in 2026. Since the FY2027 codes took effect October 1, 2026, check any diagnosis code copied from an older claim or template.

The 2024 ADA Dental Claim Form fields that changed

The 2024 version is the current ADA Dental Claim Form, the standard paper dental billing form, and the electronic 837D carries the same data. According to the ADA's completion instructions, the 2024 revision added four fields and one new specialty code:

• Payer ID (field 3.a)
• Other payer's payer ID (field 11.a)
• Date of last scaling and root planing (field 39.a)
• Locum tenens indicator (field 53.a)
• A new taxonomy code for oral and maxillofacial radiology in the provider specialty field (field 56.a)

Two of those fields affect your team's daily work. Field 39.a gives the payer the last SRP date up front, which can help it apply SRP frequency and periodontal maintenance rules without a separate records request. Use field 53.a to flag a claim from a substitute dentist treating patients while the regular dentist is away.

Step 4 in Depth: How Dental Claims Work From Submission to Acknowledgment

Dental claims work in three passes. Your team builds the claim in the PMS, and a clearinghouse checks it and forwards it to the payer as an X12 837D. The payer then accepts it into adjudication or rejects it at the front door. Your front desk seldom sees the clearinghouse pass, the middle part of the dental insurance claims process.

What is a dental claim, and what makes it clean?

A dental claim is a request for payment that lists the patient, subscriber, provider, and each procedure with its CDT code, tooth, surface, date of service, and fee. To count as a clean claim, it needs everything the payer wants on the first pass:

• Patient and subscriber data that match the payer's file
• The payer ID (field 3.a) when you have it and, on secondary claims, the other payer's ID (field 11.a)
• Billing and treating provider National Provider Identifier (NPI) and taxpayer identification number (TIN), plus the treating dentist's network status
• A CDT code valid on the date of service, with the tooth number, surface, or area of the oral cavity
• Any narratives and attachments the payer's policy asks for, such as radiographs, perio charts, and photos
• Coordination of benefits details, with the primary EOB on secondary claims

Use this list as your checklist when you teach a new hire how to bill dental claims. The legal definition is a separate question: state prompt-pay laws define a "clean claim" in their own words, so check your state's statute if a payer pays late.

Clearinghouses, rejections, and proof of timely filing

A clearinghouse scrubs each claim against payer edits, routes it, and sends back two reports. The X12 999 confirms the receiver, often the clearinghouse, found the file structurally valid, and the 277CA reports each claim as accepted or rejected. CMS doesn't list either report as a HIPAA-mandated standard.

Rejected claims don't appear on an EOB, because the payer never adjudicated them, and they often don't show up in payer portals either. Someone on your team has to open the rejection report each business day, fix the error, and resubmit, because dental claims processing starts only after the payer accepts the claim.

Keep every acceptance report. With dental electronic billing, those reports prove when the payer received your claim, and you'll need that proof to fight a timely filing denial. Many payers don't count a rejected claim as received, so the filing clock keeps running until they accept a corrected one.

Many payers count the filing deadline from the date of service, and some count secondary claims from the primary EOB date. Check each provider manual and add the limits to the payer filing list your team keeps.

Electronic attachments: the slowest part of the claim

According to the 2024 CAQH Index, practices sent 90% of dental claims fully electronically in 2023 but only 37% of dental attachments, with the rest moving by mail, fax, or portal upload. That gap makes attachments the slowest part of dental billing.

The 2025 CAQH Index puts dental administrative spending at about $6.6 billion across 5.2 billion transactions, with an estimated $1.9 billion in savings available. CAQH now operates as DataSpring, powered by CAQH, so you may see the Index cited under either name.

The CMS attachments rule sets May 26, 2028, as the compliance date for the X12 275 attachment standard. Until then, send attachments with the first submission whenever a payer's policy calls for them, which often means crowns, buildups, SRP, and implants. If you wait for the payer to ask, you add a records request and a second review before payment.

Steps 5 and 6 in Depth: Reading the EOB and ERA and Posting Payments

After adjudication, the payer explains its decision on an EOB or an ERA (the X12 835), then pays by check, EFT, or virtual card. Your team posts the payment, the contractual adjustment, and the patient's share for every procedure, line by line.

EOB vs. ERA vs. EFT

The group code on each adjusted line tells you who owes the money. X12 labels them CO (Contractual Obligation), PR (Patient Responsibility), OA (Other Adjustment), and PI (Payor Initiated Reduction). An in-network practice writes off a CO amount, and a PR amount goes on the patient's statement.

In dental insurance billing, the ERA is the payer's official record of its decision. Read the group code and the reason code together before you touch the patient's balance, because the pair tells you where each dollar goes. A CO-45 is a contractual write-off, and a PR-1 is the patient's deductible.

Posting payments without hiding underpayments

Post every payment by procedure instead of as a lump sum. A CO-45 write-off is correct only when the allowed amount matches the fee schedule you loaded for that payer. Compare the two on each ERA so you catch underpayments while you can still appeal them.

Say a dental billing team posts only the check total. It can't see that a payer paid a crown at last year's fee schedule. With line-level posting, your team sees that underpayment while the appeal window is still open.

PR-1, PR-2, and PR-3 mark the deductible, coinsurance, and copay, and those amounts go on the patient statement in step 8. Post zero-paid lines too, with their reason codes, and route them to your denial queue so your team works them before the appeal window closes.

Step 7 in Depth: Why Dental Claims Get Denied and How to Appeal

Payers often deny dental claims for eligibility gaps, frequency limits, missing documentation, outdated or wrong CDT codes, coordination of benefits problems, and late filing. Each ERA names the reason with an X12 claim adjustment reason code (CARC). That code tells you whether to correct the claim, send records, bill another payer, or appeal.

Rejection vs. denial

Dental billing teams handle two kinds of bounced claims. A rejection failed front-end edits and never reached adjudication, so you fix it and resubmit it as a new claim. Denials go through adjudication; answer each with a corrected claim, records, or an appeal. If you resend a denied claim unchanged, the payer can flag it as a duplicate (CARC 18).

The denial codes dental offices see most

Each denial on an ERA carries one of the X12 claim adjustment reason codes, often with a remark code (RARC) for detail. Check the group code on the same line before you bill the patient. You'll see these 12 codes again and again on dental ERAs:

How to write a dental appeal that gets paid

1. Read the CARC, the group code, and any remark code, and confirm it's a denial, since a rejection needs a corrected resubmission instead.
2. Check the appeal deadline on the EOB or in the provider manual. Under 29 CFR 2560.503-1, members of Employee Retirement Income Security Act (ERISA) employer plans, dental plans included, get at least 180 days after a denial to appeal; your network contract sets your own window.
3. Gather the claim copy, the EOB, chart notes, radiographs, the perio chart, and photos.
4. Write a one-page narrative that answers the payer's stated reason in the payer's own policy language and asks for one specific action.
5. Track the appeal, and use the next appeal level if the payer denies it again.

In dental claims billing, log each denial's CARC next to the step that caused it. Fix the claim in front of you, then fix that step in the dental billing process, so the same denial doesn't come back next month.

AR Follow-Up and the KPIs That Prove Your Billing Is Working

AR follow-up means working every unpaid insurance claim on the aging report until it's paid, corrected, appealed, or moved to the patient. Five monthly key performance indicators (KPIs) show whether your dental billing is working: net collection rate, days in AR, AR over 90 days, first-pass acceptance rate, and denial rate.

Working the insurance aging report

Split the insurance aging report into four buckets: 0 to 30, 31 to 60, 61 to 90, and over 90 days. Review it weekly, oldest claims and biggest dollars first, and check each payer's timely filing limit as you go. In dental billing, a claim near its filing deadline can't wait another week.

Before you call a payer, check claim status in the portal or with an X12 276/277 inquiry, and log each touch in your PMS. Run that check on any claim with no ERA after about 30 days, before anyone resubmits it.

A claim in the 61 to 90 day bucket usually means the dental billing cycle stalled somewhere between steps 4 and 7. Pull a few of those claims, find the step where each one stopped, and fix that handoff before the claims age past 90 days.

Five dental billing KPIs and how to calculate them

Neither the ADA nor CMS publishes a benchmark we can cite for these KPIs, so compare each month against your own trailing 12-month baseline as part of any dental billing process improvement plan. If your denial rate climbs, sort denials by CARC and check the "Prevent at step" column to find the step to fix.

If pulling these numbers from your PMS turns into a project of its own, ask for a free billing review. You can also see how our dental AR follow-up team works aged claims each week, oldest and largest balances first.

Step 8 in Depth: Patient Billing, Estimates, and Good Faith Estimates

Patient billing is the last step in dental billing, where your team collects the patient's share after insurance pays. It goes smoothest when the patient signs a written estimate before treatment, then gets a statement after the EOB that matches the estimate line for line.

Estimates, financial policies, and statements

Build each estimate from verified benefits, get the financial policy signed, and collect the estimated patient portion at the visit. After the EOB posts, reconcile the account: bill any shortfall, and refund any overpayment so a credit balance doesn't sit on the ledger.

A clear dental billing statement shows the date of service, the procedure, your fee, what insurance paid, the adjustments, what the patient already paid, and the balance due. Send it when the insurance payment posts, then at 30, 60, and 90 days, with a text or email payment link each time.

Good Faith Estimates for uninsured and self-pay patients

The CMS Good Faith Estimate FAQ says the No Surprises Act rule generally applies to dental providers, so you owe uninsured or self-pay patients a Good Faith Estimate (GFE). Deadlines in 45 CFR 149.610 run on business days:

• Within one business day of scheduling, when you schedule the service at least three business days out
• Within three business days of scheduling, when you schedule it at least 10 business days out
• Within three business days of a patient's request for an estimate

Under 45 CFR 149.620, if the bill comes in at least $400 above the GFE for that provider, the patient can start patient-provider dispute resolution within 120 calendar days of receiving the initial bill. Build a GFE template in your PMS for self-pay treatment plans so your team can meet those deadlines without starting from scratch.

What is balance billing in dental insurance?

Balance billing means billing the patient for the difference between your fee and the plan's allowed amount. In-network contracts prohibit it in most cases, so the payer marks that difference CO on the ERA and you write it off. Out-of-network practices can often use dental balance billing unless state law or the plan's terms limit it.

Medicaid follows its own rule. Under 42 CFR 447.15, practices accept the Medicaid payment, plus any cost sharing the state plan requires, as payment in full for covered services, so you can't bill the patient for the difference. Balance billing limits also vary by state and contract, so check yours before you send any balance bill.

Special Billing Situations: Medicare, Medicaid, Medical Insurance, and Specialties

Four situations change the standard dental claim: Original Medicare, Medicaid and CHIP, dental procedures billed to medical insurance, and specialty care with its own payment rules. Each one changes the claim form, the codes, the documentation, or which payer pays first.

Medicare: the inextricably linked rule, KX modifier, and ICD-10

According to CMS Medicare dental coverage guidance, Original Medicare doesn't pay for most dental care. Medicare does pay when dental services are "inextricably linked" to the clinical success of covered medical treatment, and CMS lists examples such as these:

• Exams and infection treatment before an organ, stem cell, or bone marrow transplant, a cardiac valve replacement, or valvuloplasty
• Exams and infection treatment before or alongside chemotherapy, CAR T-cell therapy, or high-dose antiresorptive therapy for cancer
• Workup, infection treatment, and complication care around head and neck cancer treatment
• Exams and infection treatment before or alongside dialysis for end-stage renal disease
• Ridge reconstruction at the same time as tumor removal
• Stabilizing teeth to reduce a jaw fracture
• Dental splints used in covered treatment, such as for dislocated jaw joints

You must be a Medicare-enrolled provider to get paid. CMS has required the KX modifier on these claims since July 1, 2025, along with an ICD-10 code on the 837D or 2024 ADA form. Bill Railroad Retirement Board patients on the 837P or CMS-1500, and keep notes that show how you coordinated with the treating physician.

Medicare Advantage plans must cover the same Medicare-covered dental services, so the inextricably linked rules apply there too. Any supplemental dental benefits on top of that follow the plan's own rules, which can change every January 1.

Medicaid and CHIP: documentation decides payment

According to Medicaid.gov, states decide whether to cover adult dental care, and no federal minimum applies. Children under 21 get dental services through Early and Periodic Screening, Diagnostic and Treatment (EPSDT), Medicaid's children's benefit. Medicaid is generally the payer of last resort, so bill any other coverage first.

CMS's Medicaid Compliance for the Dental Professional toolkit notes that state definitions of medical necessity vary. Your chart and notes should describe the condition requiring treatment, reference the supporting diagnostic tests, and state the diagnosis. Some states require you to bill cleanings, X-rays, and exams as a single visit, or to bundle orthodontic records into the comprehensive orthodontic code.

The same toolkit recommends internal monitoring and auditing, regular outside audits, and an audit response policy. In practice, that means someone on your team pulls a sample of Medicaid claims on a set schedule and checks each one against the chart.

Medicaid rules also change at the state level. According to DHCS, California's Medi-Cal Dental program will stop covering most dental services for some adults 19 and older without federally funded full-scope status starting July 1, 2027, except emergencies.

Dental medical billing: when to bill medical insurance

Dental medical billing applies when a medical plan covers the condition behind the dental treatment. The common cases:

• Trauma, such as S02.5XXA for a traumatic tooth fracture, initial encounter for closed fracture
• Pathology and biopsies
• Oral surgery that a medical policy covers
• Obstructive sleep apnea oral appliances (ICD-10 G47.33, HCPCS E0486)
• TMD, such as M26.623 for arthralgia of both temporomandibular joints

These claims use CPT or HCPCS plus ICD-10-CM codes on the CMS-1500 or 837P, and prior authorization is common. Billing medical insurance for dental procedures works only when the chart reads like a medical record: diagnosis, history, findings, and the reason treatment is medically necessary.

Medicare covers oral appliances for sleep apnea under its durable medical equipment benefit, through local coverage determination L33611. The E0486 device must appear on the Pricing, Data Analysis and Coding (PDAC) contractor's product list, and the dentist must enroll as a Medicare DMEPOS supplier, which can carry a surety bond requirement.

Specialty billing quick reference

Each specialty adds its own rules on top of standard dental billing.

Compliance and Time Limits: HIPAA, Timely Filing, and Timely Billing Laws

Three sets of dental billing laws and rules control the paperwork and timing of every claim. HIPAA covers electronic transactions, code sets, and patient data. Payer timely filing limits set your deadline to submit the claim, and in some states, timely billing laws also limit how long you have to bill the patient.

HIPAA rules that touch every claim

Your practice becomes a HIPAA covered entity once it sends health information electronically for a covered transaction (45 CFR 160.103). From then on, you have to use the standard transactions and code sets. An outside billing company counts as a business associate, so you need a signed business associate agreement, as the HHS business associate guidance explains.

Limit access to the minimum necessary for each role. HIPAA's Security Rule requires you to keep its policies and documentation for six years (45 CFR 164.316). The Privacy Rule sets no retention period for patient records; according to HHS, state law does.

How long does a dentist have to bill you?

The time a dentist has to bill you depends on two clocks: the payer's deadline for the claim and, in some states, a legal deadline for billing the patient. Payer contracts and provider manuals set the first one. For Original Medicare, the claim deadline is one calendar year from the date of service, under 42 CFR 424.44.

In Texas, Section 146.002 of the Civil Practice and Remedies Code generally requires a provider to bill the patient or other responsible person by the first day of the 11th month after services. Under Section 146.003, a provider who misses that deadline can't recover from the patient what the patient's health benefit plan would have paid.

Can a dentist bill you 5 years later? The answer turns on your state and the dentist's payer contracts. Debt collection statutes of limitations vary by state, many in-network contracts bar practices from passing a missed filing deadline on to the patient, and timely billing laws like Texas's can bar a late bill.

Keep a filing list for each payer and a sheet of dental billing time limits by state for every state your patients come from. Update the sheet when laws change. In Texas, for example, a 2025 amendment (HB 4145) added an option to bill a personal-injury patient's attorney.

This section is general information, not legal advice.

Is Dental Billing Difficult? Signs In-House Billing Has Hit Its Limit

Dental billing is difficult because it combines annual code changes, benefit rules that vary by plan, strict documentation, and constant follow-up, and one missed step delays payment. It stays manageable in-house when a trained dental biller owns the dental billing process and has protected time to work the aging report every week.

Watch for these signs that the work has outgrown the people doing it:

• Verification happens at scheduling and never again.
• Nobody works the aging report every week.
• AR over 90 days has grown three months in a row.
• Denials get resent without a fix to the cause.
• One person holds all the billing knowledge.
• New associates treat patients before they're credentialed.

If three or more of those signs fit, compare the cost of a dedicated in-house biller with outsourced dental billing. The three common setups trade off like this:

Our US-based billing team works inside your existing practice management software, including Dentrix, Eaglesoft, Open Dental, Denticon, CareStack, and Curve Dental. iDental Billing's published dental billing pricing is 3.95% of collections for practices collecting up to $30,000 a month, 3.45% from $30,000 to $75,000, and 2.95% from $75,000 to $150,000.

As of October 2026, billing runs month to month with no setup fee, and practices above $150,000 a month get custom pricing. Credentialing starts at $150 per commercial payer, or $95 per commercial payer for billing clients.

Dental Billing FAQs

These answers cover six common dental billing questions: how long payment takes, how often CDT codes change, billing medical and dental plans together, what a billing audit checks, how long to keep records, and when claims need X-rays.

How long does it take to get paid on a dental claim?

Payment speed depends on the payer, the plan, and your state's prompt-pay law, because no single national deadline applies. Clean electronic claims with attachments move fastest. If no ERA arrives within about 30 days, check claim status in the payer portal or with an X12 276/277 inquiry before resending, because the payer will likely deny a duplicate with CARC 18.

How often do CDT codes change?

The ADA updates CDT every January 1. It announced 67 changes for CDT 2027 on April 14, 2026, and its March 2026 Code Maintenance Committee report shows a new name for D1206, the fluoride varnish code. Code each claim with the version valid on the date of service, so a December visit billed in January uses the prior year's codes.

Can a dental office bill medical and dental insurance for the same procedure?

Yes, when the procedure is medically necessary and both plans cover it. The medical plan often pays first, with CPT or HCPCS and ICD-10-CM codes on a CMS-1500, but check both plans' coordination of benefits terms. Then send the dental claim with CDT codes and the medical EOB attached. Neither plan pays the same dollars twice.

What does a dental billing audit look at?

A dental billing audit compares your ledger against what payers decided. Expect a check of the aging report by bucket, denials grouped by CARC, and loaded fee schedules against your contracts. The reviewer also looks at the group code behind each write-off, each provider's credentialing status, and whether each claim used the right CDT version.

How long should a dental practice keep billing records?

State law sets the retention period for patient records, and payer contracts can add requirements of their own. HIPAA doesn't set one for records, though its Security Rule requires you to keep its policies and documentation for six years. Check your state's rule and your contracts, then keep chart notes, radiographs, EOBs, and ERAs for whichever period runs longest.

Do dental claims need X-rays?

Some do. Payers ask for radiographs on specific procedures, often crowns, buildups, SRP, implants, and some extractions, and each payer's policy lists which ones. If you send the X-rays with the first submission, you'll skip a records request and its delay. A payer may still ask; answer within its deadline, because the claim stays unpaid until it gets the records.

Find Out Where Your Billing Is Losing Money

Dental billing problems show up first in three reports: the insurance aging report, your denials grouped by CARC, and the collections report. Pull all three for the last 90 days, then run the five KPIs from the AR section against them to see which step is leaking.

If the numbers don't add up, or your team doesn't have time to pull them, talk to our billing team about a free billing review. Have the three reports ready when you reach out, so the conversation starts with your own numbers.