Allopathic & Osteopathic Physicians / 207ZI0100X
Individual · specialization · Medicare specialty 22
207ZI0100X Immunopathology Physician
207ZI0100X is the taxonomy code for Immunopathology, a specialization of Pathology, 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 22, Physician/Pathology, under which 14,667 practitioners are enrolled.
- 1Taxonomy code 207ZI0100X
- 2Level Specialization
- 3Medicare specialty 22 Physician/Pathology
- 4Codes in this group 238
Definition
A pathologist who specializes in the diagnosis of immunologic diseases.
— NUCC Health Care Provider Taxonomy, version 26.1
Where 207ZI0100X sits
- Group: Allopathic & Osteopathic Physicians — code 137 of 238 in the group
- Classification: Pathology
- Specialization: Immunopathology 207ZI0100X
Choose 207ZI0100X over the general Pathology code when the provider's training or certification is specifically in immunopathology; 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 207ZI0100X to Medicare specialty 22 (Physician/Pathology). That specialty — not the taxonomy code itself — is what Medicare enrollment records and uses for payment. 14,667 practitioners are enrolled under it nationally, and 15 other taxonomy codes map to the same specialty.
Other codes under the same Medicare specialty: 207ZB0001X Blood Banking & Transfusion Medicine Physician; 207ZC0006X Clinical Pathology Physician; 207ZC0008X Clinical Informatics (Pathology) Physician; 207ZC0500X Cytopathology Physician; 207ZD0900X Dermatopathology (Pathology) Physician; 207ZF0201X Forensic Pathology Physician; 207ZH0000X Hematology (Pathology) Physician; 207ZM0300X Medical Microbiology Physician; and 7 more.
Related codes
| Code | Pathology — other specializations |
|---|---|
| 207ZD0900X | Dermatopathology |
| 207ZF0201X | Forensic Pathology |
| 207ZH0000X | Hematology |
| 207ZM0300X | Medical Microbiology |
| 207ZP0007X | Molecular Genetic Pathology |
| 207ZN0500X | Neuropathology |
The nearest 6 of 15 other codes under Pathology; all are on the group page.
History of 207ZI0100X
NUCC's earliest recorded change to 207ZI0100X is from 2010 (definition added, source added).
- 2010-01-01 — definition added, source added
Find providers with 207ZI0100X
Using 207ZI0100X
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.