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

How many x-rays equal a full-mouth series?

No single number. MetLife counts nine periapicals, Alabama Medicaid 14 films, a Delta Medicaid policy rebundles past 12 - and Delta and Liberty use a fee test with no count.

There is no single answer, and that is the answer. A full-mouth series (D0210) is defined three different ways in carriers' published documents: by film count, by fee, or by named combination. MetLife treats nine or more periapicals as a complete series. Alabama Medicaid prints the number in its benefit table — 14 periapicals and bitewings. Delta Dental's own policy-code mapping rebundles a Medicaid visit that takes more than 12 periapicals. On the commercial book Delta Dental and Liberty Dental Plan use no count at all: if the fees for the individual images reach the complete-series fee, the set is a complete series. As of September 2026, Delta bundled 237 of 2,826 D0210 lines (8.4%) and MetLife bundled 217 of 3,808 first-periapical lines (5.7%) as included in another procedure.

What we measured

Every remittance line for that code at that carrier, all dates, measured on 8 September 2026 across 37 practices and more than 170 payers. "Bundled" means the line was denied as included in another procedure. All Delta member companies are pooled as Delta Dental, and cells backed by fewer than five practices are not shown.

What the carriers' own policies say

The film-count answer. The Alabama Medicaid Provider Manual, Chapter 13 (Dentist), January 2026 prints it in the benefit table:

"D0210 Intraoral – Complete series, including bitewings, consists of 14 periapicals and bitewings."

and adds the rebundling rule:

"Any combination of periapical films with or without bitewings taken on the same date of service which exceed the maximum allowed, must be billed as a Complete Intraoral Series (D0210)."

Delta Dental's own policy-code mapping — the table that ties each internal policy id to the codes it prints on a remittance — sets a count for the Medicaid lines it administers, at policy 74U:

"Medicaid considers it standard practice to bill for a full mouth series if more than 12 periapicals are taken during a single visit. Any periapical x-rays billed additionally with D0210 will be rebundled and considered part of the full mouth series."

The named-combination answer. MetLife's Preferred Dentist Program (PDP) Resource Manual, appendix current as of January 1, 2025:

"MetLife considers a Complete Series of radiographic images (D0210) as: 9 or more periapical radiographic images (D0220 - D0230) with or without bitewing radiographic images (D0270 - D0274); or, vertical bitewings (D0277) with 4 or more periapical radiographic images … or, a combination of panoramic film (D0330) and bitewing radiographic images or periapical radiographic images taken on the same date of service."

The fee answer. Delta Dental's national processing policies, as printed in the DeltaUSA Dentist Handbook, January 2026:

"Individually listed intraoral radiographic images by the same dentist/dental office are considered a complete series if the fee for individual radiographic images (excluding D0330) equals or exceeds the fee for a complete series done on the same date of service. Any fee in excess of the fee for an intraoral comprehensive series (D0210) is not billable to the patient."

Liberty's National Clinical Criteria Guidelines and Practice Parameters, 2026 says the same thing in one line: "Any combination of covered radiographs that meets or exceeds the cost of a complete series may be adjudicated as a complete series for benefit purposes." The DentaQuest-administered AmeriHealth Caritas Delaware Medicaid office reference manual runs the same test: where the total allowed amount for the radiographs taken exceeds the allowed amount for D0210, the codes billed are consolidated and paid as a complete series.

Why it depends on the plan

The count that defines the benefit and the count that triggers the payment rule are two different numbers, and they are printed in two different documents. Guardian's 2025 marketplace schedules of benefits for Illinois, Missouri and South Carolina define the covered service as "Full mouth series, of at least 14 images including bitewings" — while payment rules at other carriers fire on nine films, or on none, when the fees add up. Reading only the benefit schedule tells you what the plan will buy, not what the claim will be repriced to.

Under a fee test the answer also moves with the office's own fee schedule. Two practices taking an identical set of eight periapicals can get two different outcomes, because one practice's individual fees reach the complete-series allowance and the other's do not.

What to do

• Ask which test the plan uses during the benefit check, in those terms: a film count, a fee total, or a named combination.
• Add up the contracted allowances for the images you plan to take before the visit, not the full fees. That total against the D0210 allowance is what a fee-test carrier compares.
• When a set will clearly cross the line, bill the D0210 outright. The Alabama manual requires it, and it avoids a repriced claim.
• Record the visit against the full-mouth-series frequency once the carrier has treated it as one, whatever code was billed.
• Where the dentist is in network, the excess over the D0210 allowance is a write-off and is not billed to the patient. An out-of-network dentist has no such contract and may charge separately.

Numbers last refreshed September 2026.

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