D0365 is the CDT code for a cone beam CT that covers one full lower arch, taken and read by the same provider.
- When to use: The scan volume spans the whole mandible, such as implant planning across several lower sites, and your own provider writes the report.
- When not to use: A focused third molar or single implant site scan is D0364, both jaws is D0367, and a lower arch scan sent out to be read is D0381.
- Billing note: Routine scans before third molar surgery are a common denial, so chart the signs of nerve involvement that justified the scan and cite it in the narrative.
What D0365 covers
D0365 reports a cone beam CT whose captured volume covers one full lower arch, read and reported by the provider who took it. The single line covers the exposure, the reconstructed volume, the diagnostic read, and the written report.
Two facts must hold: the volume spans the mandible rather than a block of bone around a few teeth, and the office that scanned also interpreted. If either changes, the code changes.
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 one full lower arch. A scan that stops short of the whole mandible is D0364, and one that also reaches the upper arch is D0367. The CBCT billing guide lays out the full code family and explains why the field of view is already fixed by the scan before anyone opens the claim.
Why the lower jaw is where the field of view goes wrong
Most mandibular cone beam scans answer one of two local questions:
- 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.
- Posterior implant planning. The measurements 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 requires the whole arch. Radiation guidance says the field should be no larger than needed to see the region of interest, and CBCT delivers a higher dose than conventional dental radiographs. So many clinically correct lower-jaw scans are limited-volume scans, and a limited volume is D0364.
Coding errors start when 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. The errors run in 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 also captured the maxilla and was 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 leads to D0364 more often than most code tables suggest.
Capture and interpretation: when D0365 splits in two
D0365 covers taking the image and reading it 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 office bills D0381, the capture-only code for one full lower arch, and the reading practitioner bills D0391 for the interpretation and report. 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 reader’s side of the claim, including the diverging dates of service, is on the D0391 page.
Many lower-arch code tables are missing D0381. Add it as a separate entry with a label that names the difference from D0365, or a scan sent out to be read posts as a one-provider service by default. The rest of the setup, including labeling codes by field of view, the scan protocol template, and the benefit check before the exposure, is in setting up cone beam codes in your PMS.
Why D0365 gets denied
Cone beam coverage is tighter than routine radiograph coverage. Necessity standards, frequency windows, and plan exclusions that apply to any field of view are in the CBCT billing guide. Two denial reasons are most common on the lower arch:
- Routine screening before third molar surgery. 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 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 makes the claim reviewable.
- Field of view mismatch. A scan protocol in the chart that contradicts the code on the claim is an error a reviewer can prove. On the mandible it is usually 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.
- A volume that also captured the maxilla. That is D0367.
- A scan your office captured but sent out to be read. That is D0381, plus D0391 from the radiologist.
- A panoramic film, which is D0330, or an intraoral series, which is D0210. A panoramic reconstructed from the same acquisition is covered in the same-acquisition panoramic, including who absorbs the fee when a carrier bundles it.
Documentation that supports the claim
Record the protocol or preset name and the captured volume dimensions in the chart on the date of service. The volume dimension is what separates D0365 from D0364 below it and D0367 above it.
State the clinical question in mandibular anatomy. “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 was taken and why it covered the lower arch. The rest of what a cone beam claim needs is in the CBCT billing guide.
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 neighboring codes are picked 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; and D0368 is a TMJ series of two or more exposures. A focused scan of the third molar region is 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 most common mistake on mandibular CBCT, because third molars and posterior implant sites are both local questions that a limited field often answers. Radiation guidance points toward the smallest field that answers the clinical question, and that choice also sets the code. Check the scan protocol before picking the code.
- 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 writes the report. D0381 is capture only for one full lower arch, billed when the office sends the scan out; the reading practitioner then bills D0391 on their own claim. One scan produces either D0365 alone or D0381 plus D0391. Billing D0365 when an outside radiologist 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 cover CBCT as adjunctive imaging 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 limit CBCT for third molars to cases where the findings will affect risk assessment or treatment, and name signs of nerve involvement: darkening of the roots, loss of the cortical outline of the canal, or diversion of the canal. Those findings, charted and cited in the narrative, make the claim reviewable. Frequency limits and CBCT exclusions both exist, so verify the plan before the scan.
- Can you bill D0330 and D0365 on the same day?
- Only if the panoramic was a separate exposure. Many cone beam units reconstruct a panoramic view from the same acquisition, and billing D0330 for that reconstructed view alongside the CBCT is generally not supported. A panoramic taken on a pan machine or as its own exposure is a distinct procedure. Record which one happened, since bundling edits here are strict and vary by plan.
- Is D0365 still an active CDT code in 2026?
- Yes. CDT 2026 carried 60 changes, including six deletions and 14 revisions, and none 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
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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.