Allopathic & Osteopathic Physicians / 207ZM0300X
Individual · specialization · Medicare specialty 22
207ZM0300X Medical Microbiology Physician
207ZM0300X is the taxonomy code for Medical Microbiology, 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 207ZM0300X
- 2Level Specialization
- 3Medicare specialty 22 Physician/Pathology
- 4Codes in this group 238
Definition
A medical microbiologist is expert in the isolation and identification of microbial agents that cause infectious disease. Viruses, bacteria and fungi, as well as parasites, are identified and, where possible, tested for susceptibility to appropriate antimicrobial agents.
— NUCC Health Care Provider Taxonomy, version 26.1
Where 207ZM0300X sits
- Group: Allopathic & Osteopathic Physicians — code 138 of 238 in the group
- Classification: Pathology
- Specialization: Medical Microbiology 207ZM0300X
Choose 207ZM0300X over the general Pathology code when the provider's training or certification is specifically in medical microbiology; 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 207ZM0300X 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; 207ZI0100X Immunopathology Physician; and 7 more.
Related codes
| Code | Pathology — other specializations |
|---|---|
| 207ZF0201X | Forensic Pathology |
| 207ZH0000X | Hematology |
| 207ZI0100X | Immunopathology |
| 207ZP0007X | Molecular Genetic Pathology |
| 207ZN0500X | Neuropathology |
| 207ZP0213X | Pediatric Pathology |
The nearest 6 of 15 other codes under Pathology; all are on the group page.
History of 207ZM0300X
NUCC's earliest recorded change to 207ZM0300X is from 2007 (definition added, source added), and has been revised 1 time since.
- 2007-07-01 — definition added, source added
- 2011-07-01 — modified source
Similar codes in other groups
If 207ZM0300X 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:
- 103TP0016X Prescribing (Medical) Psychologist (Behavioral Health & Social Service Providers)
- 111NI0013X Independent Medical Examiner Chiropractor (Chiropractic Providers)
- 146N00000X Basic Emergency Medical Technician (Emergency Medical Service Providers)
- 146M00000X Intermediate Emergency Medical Technician (Emergency Medical Service Providers)
- 146L00000X Paramedic (Emergency Medical Service Providers)
- 163WM0705X Medical-Surgical Registered Nurse (Nursing Service Providers)
Find providers with 207ZM0300X
Using 207ZM0300X
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.