Allopathic & Osteopathic Physicians / 207RA0201X
Individual · specialization · Medicare specialty 11
207RA0201X Allergy & Immunology (Internal Medicine) Physician
207RA0201X is the taxonomy code for Allergy & Immunology, a specialization of Internal 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 11, Physician/Internal Medicine, under which 128,064 practitioners are enrolled.
- 1Taxonomy code 207RA0201X
- 2Level Specialization
- 3Medicare specialty 11 Physician/Internal Medicine
- 4Codes in this group 238
Definition
An internist doctor of osteopathy that specializes in the treatment of allergy and immunologic disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine can obtain a Certificate of Special Qualifications in the field of Allergy & Immunology.
— NUCC Health Care Provider Taxonomy, version 26.1
Where 207RA0201X sits
- Group: Allopathic & Osteopathic Physicians — code 47 of 238 in the group
- Classification: Internal Medicine 207R00000X
- Specialization: Allergy & Immunology 207RA0201X
Choose 207RA0201X over the general Internal Medicine code (207R00000X) when the provider's training or certification is specifically in allergy & immunology; 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 207RA0201X to Medicare specialty 11 (Physician/Internal Medicine). That specialty — not the taxonomy code itself — is what Medicare enrollment records and uses for payment. 128,064 practitioners are enrolled under it nationally, and 25 other taxonomy codes map to the same specialty.
Other codes under the same Medicare specialty: 207QB0505X Diabetology (Internal Medicine) Physician; 207R00000X Internal Medicine Physician; 207RA0000X Adolescent Medicine (Internal Medicine) Physician; 207RA0001X Advanced Heart Failure and Transplant Cardiology Physician; 207RA0401X Addiction Medicine (Internal Medicine) Physician; 207RB0002X Obesity Medicine (Internal Medicine) Physician; 207RC0000X Cardiovascular Disease Physician; 207RC0200X Critical Care Medicine (Internal Medicine) Physician; and 17 more.
Related codes
| Code | Internal Medicine — other specializations |
|---|---|
| 207RA0000X | Adolescent Medicine |
| 207RA0002X | Adult Congenital Heart Disease |
| 207RA0001X | Advanced Heart Failure and Transplant Cardiology |
| 207RC0000X | Cardiovascular Disease |
| 207RI0001X | Clinical & Laboratory Immunology |
| 207RC0001X | Clinical Cardiac Electrophysiology |
The nearest 6 of 30 other codes under Internal Medicine; all are on the group page.
History of 207RA0201X
NUCC's earliest recorded change to 207RA0201X is from 2008 (added definition, added source), and has been revised 1 time since.
- 2008-07-01 — added definition, added source
- 2011-07-01 — modified source
Similar codes in other groups
If 207RA0201X 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:
- 246QI0000X Immunology Pathology Specialist/Technologist (Technologists, Technicians & Other Technical Service Providers)
Find providers with 207RA0201X
Using 207RA0201X
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.