Allopathic & Osteopathic Physicians / 207UN0901X
Individual · specialization · Medicare specialty 36
207UN0901X Nuclear Cardiology Physician
207UN0901X is the taxonomy code for Nuclear Cardiology, a specialization of Nuclear Medicine, in the NUCC group “Allopathic & Osteopathic Physicians”. It is a code for individual providers — the kind used on a Type 1 NPI. Medicare maps it to specialty 36, Physician/Nuclear Medicine, under which 738 practitioners are enrolled.
- 1Taxonomy code 207UN0901X
- 2Level Specialization
- 3Medicare specialty 36 Physician/Nuclear Medicine
- 4Codes in this group 238
Definition
A nuclear medicine physician who specializes in nuclear cardiology.
— NUCC Health Care Provider Taxonomy, version 26.1
Where 207UN0901X sits
- Group: Allopathic & Osteopathic Physicians — code 86 of 238 in the group
- Classification: Nuclear Medicine 207U00000X
- Specialization: Nuclear Cardiology 207UN0901X
Choose 207UN0901X over the general Nuclear Medicine code (207U00000X) when the provider's training or certification is specifically in nuclear cardiology; 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
CMS's taxonomy crosswalk links 207UN0901X to Medicare specialty 36 (Physician/Nuclear Medicine). That specialty — not the taxonomy code itself — is what Medicare enrollment records and uses for payment. 738 practitioners are enrolled under it nationally, and 4 other taxonomy codes map to the same specialty.
Other codes under the same Medicare specialty: 207U00000X Nuclear Medicine Physician; 207UN0902X Nuclear Imaging & Therapy Physician; 207UN0903X In Vivo & In Vitro Nuclear Medicine Physician; 2085N0904X Nuclear Radiology Physician.
Related codes
| Code | Nuclear Medicine — other specializations |
|---|---|
| 207U00000X | Nuclear Medicine Physician |
| 207UN0903X | In Vivo & In Vitro Nuclear Medicine |
| 207UN0902X | Nuclear Imaging & Therapy |
History of 207UN0901X
NUCC's earliest recorded change to 207UN0901X is from 2010 (definition added, source added).
- 2010-01-01 — definition added, source added
Similar codes in other groups
If 207UN0901X is not quite right, these codes in other groups share a word with it — often the same field practised by a different kind of provider:
- 1835C0206X Cardiology Pharmacist (Pharmacy Service Providers)
- 1835N0905X Nuclear Pharmacist (Pharmacy Service Providers)
- 2471N0900X Nuclear Medicine Technology Radiologic Technologist (Technologists, Technicians & Other Technical Service Providers)
- 246W00000X Cardiology Technician (Technologists, Technicians & Other Technical Service Providers)
- 3336N0007X Nuclear Pharmacy (Suppliers)
Find providers with 207UN0901X
Using 207UN0901X
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); CMS Medicare Provider and Supplier Taxonomy Crosswalk, August 2026; CMS Medicare Fee-For-Service Public Provider Enrollment, extract of 2026-09-29. Checked 2026-10-24. Methodology.