Allopathic & Osteopathic Physicians / 207RI0001X
Individual · specialization · Medicare specialty 11
207RI0001X Clinical & Laboratory Immunology (Internal Medicine) Physician
207RI0001X is the taxonomy code for Clinical & Laboratory 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 207RI0001X
- 2Level Specialization
- 3Medicare specialty 11 Physician/Internal Medicine
- 4Codes in this group 238
Definition
An internal medicine physician who specializes in clinical and laboratory immunology disease management.
— NUCC Health Care Provider Taxonomy, version 26.1
Where 207RI0001X sits
- Group: Allopathic & Osteopathic Physicians — code 49 of 238 in the group
- Classification: Internal Medicine 207R00000X
- Specialization: Clinical & Laboratory Immunology 207RI0001X
Choose 207RI0001X over the general Internal Medicine code (207R00000X) when the provider's training or certification is specifically in clinical & laboratory 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 207RI0001X 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; 207RA0201X Allergy & Immunology (Internal Medicine) Physician; 207RA0401X Addiction Medicine (Internal Medicine) Physician; 207RB0002X Obesity Medicine (Internal Medicine) Physician; 207RC0000X Cardiovascular Disease Physician; and 17 more.
Related codes
| Code | Internal Medicine — other specializations |
|---|---|
| 207RA0001X | Advanced Heart Failure and Transplant Cardiology |
| 207RA0201X | Allergy & Immunology |
| 207RC0000X | Cardiovascular Disease |
| 207RC0001X | Clinical Cardiac Electrophysiology |
| 207RC0200X | Critical Care Medicine |
| 207QB0505X | Diabetology |
The nearest 6 of 30 other codes under Internal Medicine; all are on the group page.
History of 207RI0001X
NUCC's earliest recorded change to 207RI0001X is from 2010 (definition added, source added).
- 2010-01-01 — definition added, source added
Similar codes in other groups
If 207RI0001X 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:
- 103G00000X Clinical Neuropsychologist (Behavioral Health & Social Service Providers)
- 103GC0700X Clinical Neuropsychologist (Behavioral Health & Social Service Providers)
- 103TC0700X Clinical Psychologist (Behavioral Health & Social Service Providers)
- 103TC2200X Clinical Child & Adolescent Psychologist (Behavioral Health & Social Service Providers)
- 1041C0700X Clinical Social Worker (Behavioral Health & Social Service Providers)
- 126900000X Dental Laboratory Technician (Dental Providers)
Find providers with 207RI0001X
Using 207RI0001X
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.