The CDT Code: the ADA's dental procedure code set, the November-to-January maintenance cycle, and why HIPAA makes it the only one you can bill with

What it says#

The Code on Dental Procedures and Nomenclature, known as the CDT Code, is the taxonomy every dental procedure is reported with. An entry has at most three parts: a five-character alphanumeric code that begins with the letter D and is followed by four numerals, a nomenclature that is the brief written definition of the code, and an optional descriptor that further defines it. The ADA states the purpose plainly in its committee protocol: to achieve uniformity, consistency and specificity in accurately recording and reporting dental treatment.

It is federal law that makes it the code set rather than a code set. 45 CFR 162.1002 lists the standard medical data code sets the Secretary of Health and Human Services has adopted, and paragraph (a)(4) names the CDT Code, as maintained and distributed by the American Dental Association, for dental services. 45 CFR 162.1000 then requires a covered entity conducting a covered transaction to use the applicable medical data code sets that are valid at the time the health care is furnished. The transaction itself is the ASC X12N 837 Dental claim adopted at 45 CFR 162.1102.

The code set is also property. The ADA is the exclusive copyright owner of CDT, the Code on Dental Procedures and Nomenclature, Consumer-Friendly CDT and the ADA Dental Claim Form, and says that except as permitted by law all use, copying or distribution of CDT in any product or service requires a valid commercial user license. Its own FAQ answers the obvious question directly: the code set is valuable ADA intellectual property with significant maintenance costs, and revenue from publication sales and licensing offsets part of that cost.

Maintenance runs through the Code Maintenance Committee, a standing committee of the ADA's Council on Dental Benefit Programs. Its members are organizations, not people: the ADA with five representatives including the chair, twelve dental specialty organizations, two other dental professional organizations, and five third-party payer and dental benefits organizations, including the Centers for Medicare and Medicaid Services. When all are represented, 24 votes may be cast. A simple majority of those present and voting decides a motion, abstentions do not count toward the majority, a tie means the request is not accepted, and no proxy votes are permitted.

The calendar does not move. Requests may be filed at any time, but November 1 is the closing date for the next meeting and the ADA says there are no exceptions. Forms go to member organizations on December 1 and are posted publicly. The committee meets in March in Chicago in an open meeting with a public observer comment period. Decisions go to submitters in April with the final action report. The manual is published in the fourth quarter, and the version takes effect January 1.

Who it applies to#

Any practice that bills electronically, which in 2026 is essentially all of them. The obligation sits on the covered entity, so it belongs to the owner and the person who submits claims rather than to the software vendor. Anyone may ask for a change: dentists, specialty organizations, payers, and members of the public. A substantive request, meaning a new code, a deletion, or a revision to any part of an entry, goes in on the ADA's action request form and must arrive with a signed copyright assignment agreement, or the committee will not address it. Editorial requests, which fix grammar and syntax without changing the nature and scope of an entry, may only be submitted by committee member organizations and travel on a consent calendar.

Two things the CDT Code does not do. It is not a diagnosis code set: the ADA states that ICD-10-CM is the only diagnosis code set that may be used on claims submitted to dental benefit plans, and that SNODENT, while it codes conditions and findings, is not a HIPAA standard and may not be reported on a claim. It also does not decide coverage. HIPAA's administrative simplification provisions govern the format and taxonomy of the information exchanged, not a payer's adjudication policy.

What changed#

CDT 2026, in force since January 1, 2026, carries 60 changes: 31 additions, 14 revisions and 6 deletions. The additions cover point-of-care saliva testing, testing to locate a cracked tooth, duplicate dentures for each arch, non-surgical treatment of an implant with peri-implantitis, and cleaning and inspection of an existing occlusal guard. Six codes went away, including D1352, which had covered a preventive resin restoration in a permanent tooth for a patient at moderate to high caries risk, four dormant COVID-19 vaccine administration codes, and D9248, which had covered conscious sedation given by a route other than intravenous. D2391, the code for a single-surface posterior composite, lost the descriptor that had tied it to a lesion penetrating dentin, and the anesthesia codes were reworked around a revised D9230 for nitrous oxide delivered as a single agent.

CDT 2027, agreed at the March 13, 2026 committee meeting, carries 67 changes: 28 additions, 33 revisions, no deletions and 6 editorials. The ADA lists the affected areas as direct resin-based composite crowns, removal of screw-retained implant restorations, healing caps, repair or removal of fixed splints, implant-retained interim dentures, adjunctive orthodontic therapy, semi-precision abutments on natural teeth, neuromodulator and chemodenervation procedures, and orofacial pain management. It takes effect January 1, 2027 and runs through December 31, 2027.

Where the source is#

The ADA's CDT pages at ada.org carry the announcements, the committee's protocol document and the free action reports; the March 2026 report of committee decisions is a public PDF, as is the protocol effective May 15, 2026 that sets composition, voting and the timeline. The legal requirement is 45 CFR 162.1002 and 45 CFR 162.1000 on eCFR. The code set itself is not free: the manual is sold through the ADA Store and commercial reproduction requires a license, so this entry names codes and describes them in plain words rather than reproducing ADA nomenclatures and descriptors. The ADA store pages would not render for automated retrieval from this environment, so no prices are reported here.