Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Sidney P Williamson Jr., MD

Emergency Medicine Physician in Bozeman, MT · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1649368044

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Registry record

Entity type Individual (Type 1)

Name Dr. Sidney P Williamson Jr.

Credential MD

Sex Male

Practice address 915 Highland Blvd, Bozeman, MT, 59715

Phone (406) 585-5000

Enumeration date Oct 11, 2006

Last updated in NPPES Apr 15, 2025

Taxonomy & licenses

207P00000X Emergency Medicine Physician Allopathic & Osteopathic Physicians · License 10418 (MT) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
P00031418	Other	-	MEDICARE RAILROAD
3502642	Medicaid	MT	-
94845	Other	-	BCBS MT

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Sidney Williamson?

Sidney Williamson is registered in NPPES with the primary taxonomy of Emergency Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-04-15.