Dental X-rays are almost always covered, so the real question is how often the plan will pay for each type. Bitewings, panoramics, and full-mouth series each run on their own clock, and periapicals play by different rules entirely. Take an image inside the plan's window and it gets denied, even though it was clinically warranted. This guide covers how X-ray coverage works by type and why they get denied.
Last updated August 2026 · Reviewed by the PracticeAlpha billing team
The short answer. Most plans cover dental X-rays, usually at 80 to 100 percent, but the frequency depends on the image. Routine bitewings are commonly covered once or twice a year. A full-mouth series or a panoramic image is covered far less often, roughly once every three to five years. Periapicals, taken for a specific problem, are generally not subject to the same frequency limits. So X-rays are almost always covered, the denials come from exceeding the frequency for a given image type.
X-rays are not one benefit, they are several, each with its own frequency:
So the same patient can have a bitewing paid and a panoramic denied on the same day, purely because of where each sits in its frequency window. This is the diagnostic layer of the same frequency system that governs cleanings and other services.
X-ray denials are almost always about frequency, not coverage. The plan had already paid for that image type within its window, and the most common trap is a full-mouth series or panoramic taken inside the multi-year limit, when the previous one is still on the plan's clock.
Because plans generally set these limits based on ADA guidance, exceeding them makes the image the patient's cost regardless of clinical reasoning. The fix is knowing when the last one was paid. A periapical for a symptomatic tooth is a safer bet, since it usually escapes the frequency cap.
For context on what is at stake when one is denied, without insurance a set of bitewings commonly runs about $40 to $120, a single periapical about $15 to $40, a full-mouth series roughly $85 to $250, and a panoramic about $60 to $200. A 3D cone-beam CT scan (a CBCT, used for implants and surgical planning) is more, often $150 to $750, and is covered less predictably than routine 2D images. With preventive coverage at 80 to 100 percent, the patient share on routine images is usually small, so the real cost shows up when an image is denied for frequency and falls entirely on the patient.
Getting X-rays paid is a before-the-visit tracking job, the same discipline behind preventive coverage generally:
Do this and X-ray denials largely disappear. If your practice is seeing covered images bounce for frequency and land on patient statements, that is recoverable, and a free AR analysis shows how much.
X-ray denials are pure frequency, the image was fine, the timing was not. We track each image type's limit and last-paid date at verification.
See our verification serviceWithout insurance, a set of bitewings commonly runs about $40 to $120, a single periapical about $15 to $40, a full-mouth series roughly $85 to $250, and a panoramic about $60 to $200. A 3D cone-beam CT scan is more, often $150 to $750. With preventive coverage at 80 to 100 percent the patient share on routine images is usually small; the larger out-of-pocket comes when an image is denied for frequency.
Most plans cover X-rays, but coverage and frequency depend on the type. Routine bitewings, taken at check-ups, are commonly covered at 80 to 100 percent. Full-mouth series and panoramic images are usually covered too, but far less often. The question with X-rays is rarely whether they are covered, it is how often, because exceeding the plan's frequency for a given image is what triggers a denial.
Bitewings are commonly covered once or twice per 12-month period, and often at a high percentage as part of preventive care. Some plans allow one set every six months, others once a year. Because it varies, the plan's specific bitewing frequency is worth confirming, especially for patients who see the dentist more often than the plan pays for images.
Much less often than bitewings. A full-mouth series or a panoramic image is typically covered once every three to five years, with some plans stretching to a two-to-five-year window. Taking one inside that window, when the last one is still on the plan's clock, is a common denial. Knowing the date of the last full series prevents it.
Generally not. Periapical X-rays, taken to look at a specific tooth or diagnose a particular problem, are usually not subject to the same frequency limits as bitewings or full-mouth series, because they are diagnostic for a specific issue rather than routine. So a periapical taken for a symptomatic tooth is more reliably covered than a routine series.
Almost always frequency. The plan had already paid for that image type within its allowed window, most often on a full-mouth series or panoramic taken inside the multi-year limit. The X-ray was clinically fine; the timing collided with the plan's frequency rule. Plans generally set these limits based on ADA guidance, and exceeding them makes the image the patient's cost.
Verify each image type's frequency before the visit and track when the last bitewings and last full series were paid. Watch the multi-year full-mouth and panoramic windows especially, since those are the ones that bite. Confirming a new patient's imaging history from a prior office prevents the common surprise where an outside series still counts against the plan.
Free AR analysis. We pull your aging report and show where covered X-rays are being denied on frequency and timing that verification would have caught. 30 minutes. No commitment.