1223P0300X Periodontics

Definition

That specialty of dentistry which encompasses the prevention, diagnosis and treatment of diseases of the supporting and surrounding tissues of the teeth or their substitutes and the maintenance of the health, function and esthetics of these structures and tissues.

— NUCC Health Care Provider Taxonomy, version 26.1

Where 1223P0300X sits

• Group: Dental Providers — code 18 of 20 in the group
• Classification: Dentist 122300000X
• Specialization: Periodontics 1223P0300X

Choose 1223P0300X over the general Dentist code (122300000X) when the provider's training or certification is specifically in periodontics; 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

1223P0300X 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

The nearest 4 of 13 other codes under Dentist; all are on the group page.

History of 1223P0300X

NUCC's notes record no dated changes for 1223P0300X. 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.

Using 1223P0300X

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.