Insurance · Updated 2026-09-08 · 5 min read

Who pays when I go over the frequency limit?

Five answers appear in carrier documents: you owe the network rate, the dentist writes it off, you owe full charges, a copay, or a cheaper code.

"Over the limit" is not one outcome, and the difference is money. Carrier documents publish five distinct answers: the patient owes it but only at the contracted rate; the dentist must write it off and may not bill the patient at all; the patient owes the full billed charge because the network discount stops applying; the service stays covered at a stated copay; or the service is paid as a cheaper code and the patient owes the difference. Which one applies is written in the carrier's own participating-dentist contract, and two of them look identical on a statement while meaning opposite things for the patient's wallet. Frequency refusals are common enough to be worth getting right: across the practices Kaylie serves in September 2026, 22.0% of limited exam (D0140) lines at MetLife and 21.5% of panoramic (D0330) lines at Cigna were refused for frequency.

What we measured

Every claim line for that code at that carrier, paid and refused, measured September 2026. A refusal for frequency is not automatically the patient's cost — many plans make it patient responsibility and some require the office to write it off in network. That is contract-specific and these rates do not tell you which.

What the carriers' own policies say

One handbook defines both outcomes in its own glossary, and they are opposites. "Denied/Deny: If the benefit for a procedure or service is denied, the procedure or service is not a benefit of the patient's coverage, and the approved amount is collectable from the patient." Against: "Not billable to the patient: If the fee for a procedure or service is not billable to the patient, it is not benefited by Delta Dental and is not collectable from the patient by a participating dentist" (Delta Dental of New Jersey 2023 Participating Dentist Handbook, 2023). Both entries sit in the same glossary a few lines apart, and nothing printed on the patient's statement says which of the two the carrier applied.

You owe it, at the network rate. "The contract fee applies to non-covered services and to covered services even after the customer has reached their annual maximum or exceeded frequency limitations, missing tooth limitations, or other similar limitations of the dental plan" (Cigna DPPO Dental Office Reference Guide). The same guide adds: "You may not charge the patient your usual fees." MetLife states it as a ceiling: "any difference is the responsibility of the participant up to the plan allowance. The participant is not responsible for any amount that exceeds the plan allowance" (MetLife Preferred Dentist Program (PDP) Resource Manual).

The dentist writes it off. "Preventive prophylaxis procedures are disallowed with no member responsibility when submitted on the same date of service as non-surgical periodontal or periodontal maintenance procedures" (2026 BCBS FEP Dental Official Brochure, OPM FEDVIP, 2026).

You owe full billed charges. One state-employee dental certificate releases the contracting dentist from the plan's maximum allowance once a benefit-period maximum, a lifetime maximum or a frequency limit has been passed, and makes the member responsible for the difference between the dentist's charge and that allowance. Past the limit the network discount evaporates.

It becomes a copay. "Routine cleanings (oral Prophylaxis), periodontal maintenance services (following active periodontal therapy) and fluoride treatments are limited to twice a year. Two (2) additional cleanings (routine and periodontal) are available at the Co-Payment listed in the SCHEDULE OF BENEFITS" (MetLife SafeGuard DHMO Schedule of Benefits, MET245 Texas, form MET245_SOB_TX 01/26).

It becomes a cheaper code. "Comprehensive oral evaluations in excess of the 1 per calendar year limit will be processed as a periodic evaluation" (2026 BCBS FEP Dental Official Brochure, OPM FEDVIP, 2026).

Why it depends on the plan

The rule lives in the participating-dentist agreement, not in the benefit summary the patient reads, which is why a patient cannot look it up. One handbook draws the boundary in two consecutive sentences. It opens the escape route first — a participating dentist may "charge and collect their usual and customary fees for services or procedures that are not covered benefits under the plan" — and then closes it, because those non-covered benefits "do not include services for which a benefit is not payable due to contractual limitations such as deductible, copayments, coinsurance, waiting periods, annual or lifetime maximums, frequency limitations, or alternative benefit payments". So a true exclusion and an exceeded frequency are priced differently even though both arrive as an unpaid line.

The state Medicaid programmes answer it procedurally rather than commercially. Missouri, Vermont, Pennsylvania and Medi-Cal all require a signed, dated, pre-service written agreement before a member may be billed for an over-limit service at all, and in Vermont the price is capped at the published fee-schedule rate even where billing is allowed.

What to do

• Read which of the three things the payer actually did before you bill anything: denied to the patient, not billable to the patient, or paid as a different code. The first two look the same on a statement and mean opposite things.
• Where the patient owes it, quote the contracted fee, not the usual fee. Several carriers prohibit the usual fee in as many words.
• Where the plan sells the extra visit at a copay, say so at the front desk. A third cleaning at a stated copay is a different conversation from a refusal.
• On a downcode, quote the difference explicitly. The patient is being charged the gap between two codes, and an estimate that says "insurance denied it" will not survive that.
• On any public programme, get the written pre-service agreement signed before the appointment or accept that the service cannot be billed to the member.
• Best of all, check the limit before treating. In one 30-day sample, frequency refusals were predictable from the plan beforehand on 38 of 39 claims.

Numbers last refreshed September 2026.

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