Dental Radiology Billing: CDT Codes for X-Rays, CBCT, and Imaging

Dental Radiology Billing Errors Are Among the Most Frequent — and Most Preventable — in Your Practice

Dental radiology billing covers every imaging CDT code your practice uses — periapical X-rays, bitewings, panoramic radiographs, CBCT scans, and cephalometric images. These codes are billed dozens of times per day in most practices, making dental radiology billing one of the highest-volume billing categories. High volume means that even small errors — wrong code, wrong number of images, duplicate billing — compound into significant revenue loss or audit risk.

The most common dental radiology billing errors are: billing for more images than were taken (overbilling that triggers audits), billing for fewer images than were taken (underbilling that leaves revenue on the table), using the wrong code for the imaging type (panoramic code for a full-mouth series), and billing imaging on the same date as a comprehensive exam without checking frequency limitations.

This guide provides the complete dental radiology billing reference: every CDT code for dental imaging, when to use each code, frequency limitations by insurer type, CBCT billing considerations, and the specific errors that cause the most denials and audit flags.

What Are the CDT Codes for Every Type of Dental Radiograph?

Dental radiology billing uses CDT codes in the D0200-D0399 range. Selecting the correct code based on the type and number of images is the foundation of accurate billing.

• D0210 — Intraoral, complete series (full-mouth series): includes all periapical and bitewing images needed for a comprehensive radiographic survey. Typically 14-22 images. Billed as ONE code regardless of the number of individual images.
• D0220 — Intraoral, periapical, first image: the first periapical X-ray taken during a visit.
• D0230 — Intraoral, periapical, each additional image: each periapical after the first. Bill D0220 once + D0230 for each additional. Example: 3 periapicals = D0220 + D0230 x2.
• D0270 — Bitewing, single image: one bitewing radiograph.
• D0272 — Bitewings, two images: standard for anterior bitewings or limited posterior check.
• D0274 — Bitewings, four images: the standard recall bitewing set (right and left premolar + molar).
• D0277 — Vertical bitewings, 7-8 images: used for periodontal assessment. Higher reimbursement than D0274.
• D0330 — Panoramic radiographic image: single panoramic (panorex) image.
• D0340 — 2D cephalometric radiographic image: lateral cephalometric for orthodontic treatment planning.
• D0364 — Cone beam CT, limited field of view (less than one jaw): used for implant planning, endodontic assessment, or impacted tooth evaluation.
• D0365 — Cone beam CT, both jaws with or without cranium: full-field CBCT scan.
• D0367 — Cone beam CT, both jaws with or without cranium, with field of view of both jaws with or without cranium (replaces D0365 in some coding scenarios).

What Are the Insurance Frequency Limitations for Dental Radiology?

Dental radiology billing frequency limitations are the most common reason for imaging claim denials. Every insurance plan limits how often specific imaging types can be billed. Exceeding these limits results in automatic denial regardless of clinical necessity.

The specific limitations vary by plan, but these ranges represent the most common patterns across major dental insurers.

• Full-mouth series (D0210): once every 3-5 years. Some plans allow every 3 years; others require 5 years between FMX. The most restrictive limitation in dental radiology billing.
• Bitewings (D0272/D0274): once every 6-12 months for adults, once every 6 months for children under 18. Most PPO plans cover annual bitewings. Some HMO plans limit to every 12 months.
• Panoramic (D0330): once every 3-5 years. Similar limitations to FMX. Some plans do not cover panoramic if an FMX was taken within the same period (they consider them interchangeable).
• Periapical (D0220/D0230): typically no frequency limitation per tooth — but limited to the number clinically indicated. Billing 4 periapicals on every recall visit without clinical justification triggers audit.
• CBCT (D0364/D0365): coverage varies dramatically. Many plans exclude CBCT entirely. Plans that cover it typically limit to once per treatment case (e.g., one CBCT for implant planning, not repeated imaging).
• Cephalometric (D0340): typically covered once per orthodontic case. Some plans cover a second cephalometric at the end of orthodontic treatment for comparison.

How Do You Bill for CBCT (Cone Beam CT) Scans in a Dental Practice?

CBCT dental radiology billing is the most complex and most under-billed imaging category. Practices that invest $80,000-150,000 in a CBCT unit often under-recover because they do not understand the billing codes, the coverage landscape, or the documentation requirements.

The primary CBCT billing codes are D0364 (limited field of view — less than one jaw) and D0365/D0367 (both jaws or full field of view). D0364 is used for focused imaging — implant site assessment, endodontic evaluation of a single tooth, impacted third molar assessment. D0365/D0367 is used for comprehensive 3D imaging — full-arch implant planning, orthodontic assessment, complex surgical planning.

Dental insurance coverage for CBCT is inconsistent. An estimated 40-50% of dental PPO plans cover CBCT with pre-authorization. The remainder either exclude CBCT entirely or cover it only for specific indications (implant planning, pathology evaluation). Always verify coverage and pre-authorize before taking the scan.

Medical insurance may cover CBCT when the indication is a medical condition — TMJ disorder, suspected pathology, trauma evaluation, or sleep apnea assessment. Medical billing for CBCT uses CPT codes (70486-70488) rather than CDT codes, and requires ICD-10 diagnosis codes. This is the dental-medical cross-coding scenario similar to sleep medicine billing — and requires medical claim submission expertise.

What Are the Most Common Dental Radiology Billing Errors?

These dental radiology billing errors account for the majority of imaging claim denials and audit flags. Most are simple coding mistakes that are easily correctable with awareness.

• Billing D0210 (FMX) when you took individual periapicals — if you took 4 periapicals and bitewings, bill D0220 + D0230x3 + D0274. Do not bill D0210 unless you took a complete series (14-22 images covering all teeth). Billing D0210 for a partial series is overbilling.
• Billing D0220 + D0230 alongside D0210 on the same date — a full-mouth series (D0210) includes all periapicals. You cannot bill additional periapicals on the same date as an FMX.
• Billing D0274 (4 bitewings) when you took 2 — if the patient only needed right-side bitewings (2 images), bill D0272, not D0274. Billing for images not taken is fraud.
• Not checking frequency before taking the image — taking a panoramic on a patient whose plan covers panoramic only every 5 years, when the last one was 3 years ago. The claim is denied. Fix: check imaging history and frequency limits before ordering the image.
• Billing panoramic + FMX on the same date — most insurers consider these duplicative. Billing both on the same date triggers denial for one. If you need both (rare), document the clinical necessity for each separately.
• Under-billing periapicals — taking 3 periapicals but only billing for 1 because the team forgot to count. Fix: document every image taken in the clinical note and reconcile against the billing at end of day.

How Do You Document Dental Radiology for Billing Compliance?

Dental radiology billing documentation must support every image billed. In an audit, the insurer or regulatory body will match your billed codes against the images in the patient record. If you billed D0220 + D0230 x 2 (3 periapicals), there must be exactly 3 periapical images in the patient chart dated on the billed date of service.

For each radiographic image, document: date taken, type of image (periapical, bitewing, panoramic, CBCT), tooth number or area (for periapicals), and clinical indication (why the image was needed). The clinical indication is especially important for images beyond routine recall — periapicals for a toothache, CBCT for implant planning, or vertical bitewings for periodontal evaluation.

Retain all digital images indefinitely. Unlike paper X-rays that degraded over time, digital images should be backed up and retained as part of the permanent patient record. Most state dental boards require retention of dental records (including radiographs) for 7-10 years after the last date of treatment, or longer for minor patients.

DentaFlex builds custom billing tools that can include imaging frequency tracking — showing when the last FMX, panoramic, and bitewings were taken for each patient, so your team checks frequency limits before ordering images rather than after the claim is denied. Contact masao@dentaflex.site or call 310-922-8245.