D0251 is the CDT code for an extra-oral posterior dental radiographic image — an image of the posterior teeth in both arches captured with the sensor or film positioned outside the mouth, rather than against the teeth.
Informational only — confirm the official CDT descriptor and your payers' rules independently. This is general guidance, not billing, coding, or clinical advice.
When to Use the D0251 Code
Use D0251 when posterior teeth are imaged extra-orally — the receptor sits outside the mouth, so the procedure does not require intraoral film placement. It is widely reported when a patient cannot tolerate a conventional intraoral bitewing because of a strong gag reflex, limited opening, or other physical limitations, and the posterior teeth are captured on equipment that produces an extra-oral image.
Keep D0251 distinct from the intraoral bitewing codes — D0272 (two bitewings) and D0274 (four bitewings) — which require the receptor inside the mouth. It is also not a panoramic (D0330); a pan is a single wide image of the whole jaws, whereas D0251 is specifically the posterior dental image obtained extra-orally. Choosing D0251 when an intraoral bitewing was actually taken — or vice versa — is a common miscode.
Documentation & Clinical Scenarios
Because D0251 is the extra-oral alternative to a bitewing, the chart should make the technique and the reason clear:
- That the image was obtained extra-orally and why (gag reflex, limited opening, patient tolerance, or operator preference).
- The region captured — posterior teeth, both arches.
- The diagnostic interpretation — caries check, bone levels, or other findings.
- The provider and date.
Note what is billed separately. The evaluation (for example, a periodic exam, D0120) and any treatment that day carry their own codes; D0251 covers only the extra-oral posterior image itself.
Insurance & Billing Tips
- Verify the benefit and frequency. Bitewing-type imaging is usually subject to a frequency limit (often once or twice per benefit year); confirm before exposing.
- Expect benefit substitution. Some payers reimburse D0251 at a bitewing or alternate-benefit allowance rather than a separate rate — check how each plan maps it.
- Document the extra-oral indication. A note explaining why intraoral imaging wasn't feasible supports the claim if questioned.
- Don't double-report with intraoral bitewings. D0251 and D0272/D0274 for the same posterior survey on the same day are generally not both payable.
- Attach the image if requested. Payers may ask for the radiograph to confirm the service.
Example Case
An older patient with a pronounced gag reflex cannot tolerate intraoral bitewing sensors. To evaluate the posterior teeth for decay and bone levels, the office captures an extra-oral posterior image on the appropriate equipment. The dentist reviews it, documents the technique and findings, and the visit is coded D0251 for the image alongside D0120 for the periodic evaluation. Because the office verified imaging benefits and noted the extra-oral indication, the claim processes cleanly.
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Frequently Asked Questions
How is D0251 different from a regular bitewing?
A regular bitewing — D0272 or D0274 — places the receptor inside the mouth against the teeth. D0251 captures the posterior teeth extra-orally, with the receptor outside the mouth, which is useful when a patient can't tolerate intraoral placement. The diagnostic goal is similar (caries and bone levels), but the technique and the code differ.
Is D0251 the same as a panoramic X-ray?
No. A panoramic image (D0330) is a single wide view of the entire jaws, condyles, and sinuses. D0251 is specifically a posterior dental image obtained extra-orally — focused on the back teeth, not the whole jaw. They are separate codes for different purposes and should not be substituted.
How often will insurance cover D0251?
Coverage typically follows the plan's bitewing or radiograph frequency limit — often once or twice per benefit year — and some payers reimburse D0251 at an alternate-benefit (bitewing) allowance. Verify the specific plan's frequency and mapping before the visit so the patient knows what to expect.
Do I need to document why the image was taken extra-orally?
Yes, it helps. A short note explaining the indication — gag reflex, limited opening, or patient tolerance — supports the claim if the payer questions why an extra-oral image was used instead of a standard intraoral bitewing. Pair it with the region captured and the interpretation for a complete record.
Confirm the current CDT descriptor and your specific payer policies before billing — browse the full dental code library or see our insurance verification feature.