Dental Providers / 1223E0200X
Individual · specialization
1223E0200X Endodontics
1223E0200X is the taxonomy code for Endodontics, a specialization of Dentist, in the NUCC group “Dental Providers”. It is a code for individual providers — the kind used on a Type 1 NPI. It has no entry in the CMS Medicare taxonomy crosswalk.
- 1Taxonomy code 1223E0200X
- 2Level Specialization
- 3Medicare specialty Not in the crosswalk
- 4Codes in this group 20
Definition
The branch of dentistry that is concerned with the morphology, physiology and pathology of the human dental pulp and periradicular tissues. Its study and practice encompass the basic and clinical sciences including biology of the normal pulp, the etiology, diagnosis, prevention and treatment of diseases and injuries of the pulp and associated periradicular conditions.
— NUCC Health Care Provider Taxonomy, version 26.1
Where 1223E0200X sits
- Group: Dental Providers — code 9 of 20 in the group
- Classification: Dentist 122300000X
- Specialization: Endodontics 1223E0200X
Choose 1223E0200X over the general Dentist code (122300000X) when the provider's training or certification is specifically in endodontics; the general code covers the classification as a whole. A provider may report more than one taxonomy code on an NPI but marks one as primary.
Medicare
1223E0200X has no entry in the CMS Medicare Provider and Supplier Taxonomy Crosswalk. That usually means Medicare does not enroll this kind of provider under its own specialty — the provider can still hold an NPI and use this code on claims to other payers.
Related codes
| Code | Dentist — other specializations |
|---|---|
| 122300000X | Dentist |
| 1223D0004X | Dental Anesthesiology |
| 1223D0001X | Dental Public Health |
| 1223G0001X | General Practice |
| 1223P0106X | Oral and Maxillofacial Pathology |
| 1223X0008X | Oral and Maxillofacial Radiology |
The nearest 6 of 13 other codes under Dentist; all are on the group page.
History of 1223E0200X
NUCC's notes record no dated changes for 1223E0200X. The code set is republished every January and July, when codes are added, retitled or marked inactive; this page reflects version 26.1, so check the NUCC site if you are reading it after the next release.
Find providers with 1223E0200X
Using 1223E0200X
The code goes in the taxonomy field of the NPI application in NPPES, and on claims where a payer asks for it — box 24J (shaded) or 33b on the CMS-1500 with the ZZ qualifier, or the PRV segment of an 837 electronic claim. Payers match it against the taxonomy on the NPI record and, for Medicare, against the specialty on the enrollment, so all three should agree. To see which code a provider uses, search their NPI in the lookup.
Sources: NUCC Health Care Provider Taxonomy code set, version 26.1 (CSV). Checked 2026-10-24. Methodology.