Allopathic & Osteopathic Physicians / 208U00000X
Individual · classification
208U00000X Clinical Pharmacology Physician
208U00000X is the taxonomy code for Clinical Pharmacology, in the NUCC group “Allopathic & Osteopathic Physicians”. It is a code for individual providers — the kind used on a Type 1 NPI. It has no entry in the CMS Medicare taxonomy crosswalk.
- 1Taxonomy code 208U00000X
- 2Level Classification
- 3Medicare specialty Not in the crosswalk
- 4Codes in this group 238
Definition
Clinical pharmacology encompasses the spectrum of activities related to the discovery, development, regulation, and utilization of safe and effective drugs.
— NUCC Health Care Provider Taxonomy, version 26.1
Where 208U00000X sits
- Group: Allopathic & Osteopathic Physicians — code 11 of 238 in the group
- Classification: Clinical Pharmacology 208U00000X
Clinical Pharmacology has no specializations, so 208U00000X is the only code for it. A provider may report more than one taxonomy code on an NPI but marks one as primary.
Medicare
208U00000X has no entry in the CMS Medicare Provider and Supplier Taxonomy Crosswalk. That usually means Medicare does not enroll this kind of provider under its own specialty — the provider can still hold an NPI and use this code on claims to other payers.
Related codes
No other codes share the classification Clinical Pharmacology. The rest of Allopathic & Osteopathic Physicians is on the group page.
History of 208U00000X
NUCC's earliest recorded change to 208U00000X is from 2008 (modified definition).
- 2008-07-01 — modified definition
Similar codes in other groups
If 208U00000X 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)
- 174V00000X Clinical Ethicist (Other Service Providers)
Find providers with 208U00000X
Using 208U00000X
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). Checked 2026-10-24. Methodology.