CDT CODING · MEDICAL CROSS-CODING

Dental Billing Services

We code and submit dental claims, chase down what payers owe, and cross-code the cases that belong on a medical claim instead. Practices across the country rely on us to keep denials down and payments moving without adding another task to the front desk's day.

50-state coverage From solo practices to multi-location dental groups
Two code sets, one claimCDT paired with CPT and ICD-10-CM when a case qualifies
Medicaid by state Fee schedules and prior-authorization rules tracked separately per state
Start to finish Credentialing, verification, claims, appeals, and collections

CDT CODES VS. CPT/ICD-10-CM

Dental claims run on their own set of rules

A dental claim is built around CDT codes and the ADA Dental Claim Form, not the CPT and ICD-10-CM codes a physician's office reports on a CMS-1500. The two systems overlap only when a procedure has a medical cause behind it. Billing staff who move between both forms correctly, and know when a case belongs on each one, are harder to find than staff who only know one side of it.

FORM CMS-1500

Medical claims

  • CPT procedure codes
  • ICD-10-CM diagnosis pointers
  • Place-of-service and modifier reporting
VS
FORM ADA DENTAL CLAIM

Dental claims

  • CDT procedure (D-series) codes
  • Tooth, surface, and quadrant identifiers
  • A code set the American Dental Association revises every year
Yearly maximum

Benefit caps that reset annually

Most dental plans cap what they'll pay in a year at a fixed dollar amount, and that ceiling resets on the plan's renewal date no matter what other coverage the patient carries.

Missing tooth clause

A clause that can void a whole claim

Some plans won't pay to replace a tooth that was already missing before the patient's coverage began. Missed during verification, it can sink an entire bridge or partial denture claim.

Waiting periods

Delayed coverage for new patients

A newly enrolled patient may have to wait several months before major work like crowns or dentures is covered at all, a rule that rarely comes up in general medical billing.

WHERE DENTAL CLAIMS GET COMPLICATED

Billing problems that don't show up in medical offices

Dental to medical

Recognizing when a claim belongs to both payers

Oral surgery, biopsies, facial trauma, and sleep apnea appliances can often be billed to a medical plan. Medicare's general exclusion of dental care lifts when the service is directly tied to a covered medical procedure, such as a workup before an organ transplant or care connected to head and neck cancer treatment. Cases outside that scope are reported with a GY modifier instead.

Two plans, one patient

Sequencing claims when coverage overlaps

When a patient carries separate medical and dental plans, the order claims go out in affects how fast they get paid. Billing the wrong plan first, or leaving the primary carrier's explanation of benefits off the secondary claim, is a routine cause of delay.

Alternate benefit rule

Getting paid for the material actually used

Many plans pay for the lower-cost, clinically acceptable option even when the dentist used something more durable — a composite filling on a back tooth is often reimbursed at the amalgam rate unless the claim explains why.

Medicaid, state by state

No single Medicaid rulebook to follow

Federal law guarantees dental coverage for patients under 21. Adult coverage is optional, and each state sets its own scope, fee schedule, and prior-authorization requirements, so a multi-state practice is working several rulebooks at the same time.

D0100 THROUGH D9999

How CDT procedure codes are organized

The current dental code set groups every procedure into twelve categories, from a first exam through a full arch of implants. Knowing which category a procedure falls into is the first step in coding it correctly.

D0100–D0999
Diagnostic
D1000–D1999
Preventive
D2000–D2999
Restorative
D3000–D3999
Endodontics
D4000–D4999
Periodontics
D5000–D5899
Removable prosthodontics
D5900–D5999
Maxillofacial prosthetics
D6000–D6199
Implant services
D6200–D6999
Fixed prosthodontics
D7000–D7999
Oral and maxillofacial surgery
D8000–D8999
Orthodontics
D9000–D9999
Adjunctive general services
1–32 adult tooth numbers A–T primary tooth letters M O D B L surface codes UR · UL · LR · LL quadrant codes GY modifier for excluded dental services

What we ask for so a claim goes out clean

  • Recent bitewing, periapical, or panoramic images for the tooth or area involved
  • Periodontal charting with probing depths attached to any perio procedure
  • A short written explanation for procedures a payer is likely to question, such as full mouth debridement or extra imaging
  • For orthodontic cases, the total number of months the active treatment plan covers

BEFORE THE APPOINTMENT

Checking coverage before the patient sits down

Verifying a dental benefit needs to go beyond confirming the plan is active. A pre-treatment estimate for a crown, bridge, implant, or orthodontic case isn't always required, but it shows what the plan will actually pay before any work starts.

For cases that cross over to a medical payer, such as oral surgery or a sleep apnea appliance, prior authorization from the medical carrier is often required and follows the same documentation standard as any other medically necessary procedure.

What gets checked before treatment begins

  • How much of the annual maximum is left
  • Whether the deductible has been met
  • How often the plan pays for exams and cleanings
  • Any waiting period tied to major procedures
  • The plan's missing tooth clause wording
  • Whether an alternate benefit provision applies to the planned procedure

What we track once a claim goes out

  • Annual maximum used and remaining for each patient, by plan year
  • Pre-treatment estimates that were never converted into a submitted claim
  • Which payments came from the dental benefit and which should have gone to a medical payer instead

AFTER SUBMISSION

Following the claim through to payment

Payment posting has to reconcile against the per-tooth, per-surface detail on the dental claim form. Following up on unpaid claims takes staff who can read an explanation of benefits that cites a missing tooth clause or an alternate benefit downgrade, not just a generic denial code.

Practices that handle both routine and surgical cases benefit from a process that flags oral surgery and appliance claims for a medical-necessity review before they go out, rather than after a denial comes back.

HOW WE APPROACH THE WORK

Why practices choose A2Z Billings

We code every dental claim against the code set the American Dental Association currently publishes, and we track each carrier's frequency limits, missing tooth clauses, and alternate benefit rules by plan rather than by habit.

Claims coded against the dental code set as it stands today, not an outdated version

Medical cross-coding prepared with full CPT and ICD-10-CM support, including the GY modifier where it applies

Separate fee schedules and prior-authorization checklists kept for each state we bill Medicaid in

Coding decisions checked against current CMS and ADA guidance rather than a fixed internal list

One team handling credentialing, eligibility, claims, denial follow-up, and collections

Support for practices from a single provider to multi-location groups, in any state

QUESTIONS FROM THE FRONT DESK

Frequently Asked Questions

How do you decide whether a procedure should be billed to the dental plan, the medical plan, or both?

We look at the clinical reason behind the procedure. A tooth extraction done for routine restorative reasons goes to the dental plan. The same extraction done to prepare a patient for radiation treatment or transplant surgery typically qualifies for medical billing, so we code it in CPT and ICD-10-CM instead and coordinate it with any dental benefit that also applies.

What happens when a patient has both dental and medical coverage active for the same procedure?

Coordination of benefits comes into play. We confirm which plan pays first, file the primary claim, then attach that plan's explanation of benefits when we submit to the secondary payer. Skipping that attachment is one of the more common reasons a secondary claim gets held up.

How do you keep track of which procedures a payer will downgrade to a lower-cost alternative?

Alternate benefit rules vary by individual plan, not by payer as a whole, so we check the specific plan's provision before treatment whenever we can. When a downgrade shows up on a payment we didn't expect, we compare it against the plan's own language before deciding whether to appeal.

Does Medicare ever pay for a dental procedure?

Only in limited situations. Medicare generally excludes routine dental care, but coverage opens up when a dental procedure is directly tied to a covered medical treatment, such as an evaluation required before certain cancer treatments or organ transplants. We check the circumstances of each case rather than assuming a procedure is automatically excluded.

How is Medicaid billing different from one state to another?

Coverage for children is set by federal rule, but adult dental coverage under Medicaid is left to each state to decide, along with the fee schedule and prior-authorization requirements that go with it. We keep those rules separate by state instead of applying one national policy to every Medicaid patient.

What causes most periodontal claims to come back denied or downgraded?

Charting gaps, most often. Payers want to see documented pocket depths and evidence of bone or attachment loss before they'll approve scaling and root planing. Without that charting attached, the claim is often paid at the lower prophylaxis rate instead, or denied outright.

What do you need from our office before you can bill a new patient's first claim?

Current radiographs, periodontal charting where it applies, a signed treatment plan for anything beyond routine care, and documentation supporting medical necessity if the case might cross over to a medical payer. We'll flag anything missing on a case-by-case basis as we onboard your patients.

READY WHEN YOU ARE

Start with a claims review

If claims are getting denied, downgraded, or paid slower than they should be, we’ll look at what your practice is actually submitting and show you where it’s breaking down.

Reach out and we’ll set up a time to go over your billing, coding, and collections process.

We'll point out exactly what's missing from your claims, one by one.