D0365 Dental Code: CBCT of the Lower Arch (Mandible)

Written by Tabby M. Updated for CDT 2026

D0365 is the CDT code for a cone beam CT whose captured volume covers one full lower arch, where the same provider takes the scan and reads it.

Field of view is a setting on the machine, and it decides the code. On the lower jaw that setting gets picked in the operatory, usually for a third molar or a posterior implant site, and then the claim goes out under whichever CBCT code the office bills most often. If the volume was a focused block of bone around the back molars, D0365 overstates what was captured. If the operator opened the field wide enough to take in the upper arch too, D0365 undercodes it. The fee moves with the field of view, so a carrier reviewing the scan is comparing the code you billed against the volume in the file.

On this page

What D0365 covers

D0365 reports a cone beam CT whose captured volume takes in one full lower arch, read and reported by the provider who took it. The single line pays for the exposure, the reconstructed volume, the diagnostic read, and the written report.

Two facts have to hold before the code fits. The volume spans the mandible rather than a block of bone around a few teeth, and the office that scanned also interpreted. Change either one and the code changes with it.

The distinguishing axis: how much anatomy the volume covers

Every code in the capture-and-interpretation series describes the same machine doing the same thing. The variable is the size of the captured volume, and D0365 is the row where that volume is one full lower arch. A scan that stops short of the whole mandible is D0364, and one that reaches the upper arch as well is D0367. The full code family and the reason the field of view is already a fact about the scan by the time anyone opens the claim are both in the CBCT billing guide.

Why the lower jaw is where the field of view goes wrong

Two clinical questions drive most mandibular cone beam scans, and both of them are local.

The first is third molar assessment before extraction. The surgeon wants to see where the inferior alveolar canal runs relative to the roots, and whether the cortical outline of the canal is intact. The second is posterior implant planning, where the numbers that matter are ridge width, the position of the buccal plate, and the distance from the crest down to the canal or forward to the mental foramen.

Neither question requires the whole arch. Radiation guidance says the selected field should be no larger than what is needed to see the region of interest, and CBCT delivers a higher dose than conventional dental radiographs. So a large share of clinically correct lower-jaw scans are limited-volume scans, and a limited volume is D0364.

That is exactly where the coding goes sideways. A practice sets up one generic CBCT entry in the code table, or the operator runs the unit’s stock lower-arch preset out of habit, and the claim stops reflecting the exposure. The error runs both directions. A focused scan around teeth 17 and 32 billed as D0365 claims more coverage than the machine captured. A genuine full-arch scan billed as D0364 gives away fee the practice earned. A wide scan that pulled in the maxilla and got billed as D0365 understates a D0367.

The general rule, take the smallest volume that answers the question and never widen the field to reach a bigger code, is in the CBCT billing guide. On the mandible it resolves to D0364 more often than most code tables suggest, because the canal question and the implant-site question are both answerable inside a limited volume.

Capture and interpretation: when D0365 splits in two

D0365 bundles two pieces of work, taking the image and reading it, and that bundle holds when one provider does both. When the office captures the volume and sends it to an oral and maxillofacial radiologist, the scan becomes two procedures on two claims. The capture-only twin at this field of view is D0381, one full lower arch, and the reading practitioner bills D0391 for the interpretation and report. A lower-arch scan sent out is D0381, not whichever capture code sits nearest in the list. Billing D0365 while an outside radiologist bills D0391 for the same volume reports the interpretation twice.

What makes two practitioners unassociated, and how carriers enforce the split, are in the CBCT billing guide. The claim mechanics on the reader’s side, including the diverging dates of service, are on the D0391 page.

Why D0365 gets denied

Cone beam coverage is tighter than routine radiograph coverage, and most of what drives a denial holds for any field of view. Necessity standards, frequency windows, and outright plan exclusions are covered in the CBCT billing guide.

Two of them bite hardest on the lower arch. The first is routine screening before third molar surgery, because scanning every case reads as screening rather than assessment. The 2026 ADA and AAOMR consensus recommendations say cone beam for third molars should be used only if the findings will affect risk assessment or treatment decisions, and they name the signs of nerve involvement that support it: darkening of the roots, loss of the cortical outline of the canal, and diversion of the canal. One of those described in the chart and cited in the narrative is what makes the claim reviewable.

The second is field of view mismatch. A scan protocol in the chart that contradicts the code on the claim is the version of this a reviewer can prove, and on the mandible the contradiction usually runs one direction, a limited volume billed as a full arch.

When to bill D0365, and when not

Bill D0365 when your office captures a cone beam volume covering one full lower arch and your provider interprets it. The usual cases:

  • Implant planning across multiple lower sites, where the scan legitimately spans the arch.
  • Evaluation of pathology, impactions, or bony anatomy where the clinical question runs the length of the mandible.
  • Pre-surgical or orthodontic assessment that needs the full lower arch in one dataset.

Do not bill D0365 for:

  • A focused scan of one region or one implant site. That is D0364, even though the anatomy is mandibular.
  • A volume that also captured the maxilla. Both jaws is D0367.
  • A scan your office captured but sent out to be read. The capture is D0381, and the radiologist bills D0391.
  • A panoramic film, which is D0330, or an intraoral series, which is D0210. Those are 2D radiographs and different procedures entirely.

Documentation that supports the claim

The documentation fact specific to D0365 is the volume dimension in the scan log, because that is what separates it from D0364 below it and D0367 above it. Record the protocol or preset name and the captured dimensions in the chart, on the date of service.

State the clinical question in mandibular anatomy while you are there. “Assess position of the inferior alveolar canal relative to the distal root of tooth 17 before extraction; panoramic shows loss of the cortical outline of the canal” tells a reviewer why the scan happened and why it happened on the lower arch. The rest of what a cone beam claim needs is in the CBCT billing guide.

What to get right in your PMS

The entry most lower-arch code tables are missing is D0381, sitting separately from D0365 with a label that names the difference. Without it, a scan your office captured and sent out to be read posts as a one-provider service by default. The rest of the cone beam setup, labeling the codes by field of view, the scan protocol template, and the benefit check before the exposure, is in the CBCT billing guide. The rule behind the same-date panoramic, and who absorbs the fee when a carrier bundles it, is in the same-acquisition panoramic.

FAQs

What is the dental code for a CBCT of the lower jaw?
D0365, when the scan covers one full lower arch and the same provider both captures and interprets it. The neighbors are picked the same way, by how much anatomy the volume covers. D0364 is a limited volume, less than one whole jaw. D0366 is one full upper arch. D0367 is both jaws. D0368 is a TMJ series of two or more exposures. A lower-jaw scan is only D0365 if the captured field actually spans the arch, so a focused scan of the third molar region belongs on D0364 even though the anatomy is mandibular.
What is the difference between D0365 and D0364?
How much the scan captured. D0365 is a full lower arch. D0364 is a limited field of view, less than one whole jaw, which is what most single-site scans are. This is the mistake that shows up most on mandibular CBCT, because the two everyday reasons to scan a lower jaw, third molars and posterior implant sites, are both local questions that a limited field often answers. Radiation guidance points the operator toward the smallest field that answers the clinical question, and that same choice sets the code. Read the scan protocol before picking the code rather than defaulting to whichever CBCT line the office uses most.
What is the difference between D0365 and D0381?
Who reads the scan. D0365 is capture and interpretation together, billed when the office that took the scan also produces the diagnostic report. D0381 is capture only at the same field of view, one full lower arch, billed when the office takes the scan and sends it out. In that split, the reading practitioner bills D0391 for the interpretation and report on their own claim. One scan produces either D0365 by itself or D0381 plus D0391 from two different providers. Billing D0365 when an outside radiologist actually wrote the report bills the interpretation twice.
Does insurance cover a CBCT before wisdom tooth extraction?
It depends on the plan and on what the record shows. Carriers generally treat CBCT as adjunctive advanced imaging that is covered when 2D films cannot answer the clinical question, and routine screening before third molar surgery is a common denial. The 2026 ADA and AAOMR consensus recommendations say CBCT for third molars should be used only if the findings will affect risk assessment or treatment decisions, naming signs of nerve involvement such as darkening of the roots, loss of the cortical outline of the canal, or diversion of the canal. Those findings, described in the chart and cited in the narrative, are what makes the claim reviewable. Frequency limits and outright CBCT exclusions both exist, so verify the specific plan before the scan.
Can you bill D0330 and D0365 on the same day?
It depends on whether the panoramic was a separate exposure. Many cone beam units reconstruct a panoramic view from the same acquisition, and when the pan comes out of the 3D scan rather than its own exposure, billing D0330 alongside the CBCT for that single acquisition is generally not supported. A panoramic taken separately, on a pan machine or as its own exposure, is a distinct procedure. Note in the record which one happened, since bundling edits in this area are strict and vary by plan.
Is D0365 still an active CDT code in 2026?
Yes. D0365 is active in CDT 2026 and the cone beam block was untouched by that year's changes. CDT 2026 carried 60 changes, including six deletions and 14 revisions, and none of them landed in the diagnostic imaging range. The capture-and-interpretation series D0364 through D0368, the capture-only series D0380 through D0384, and the standalone interpretation code D0391 all remain in force.

Related codes

Need help billing this code?

We handle D0365 claims daily.

If your team is spending time on denials, narratives, or carrier follow-up for this code, we can take it off your plate. We work inside your PMS and post payments the same week.

Book a 30-minute call

CDT codes are maintained by the American Dental Association. This page is an editorial billing guide, not the official ADA code descriptor. Verify current coverage policies with each carrier before submitting claims.