Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

William Stewart, M.D.

Urology Physician in Kalispell, MT · enumerated 2007.

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

National Provider Identifier

1598881377

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Registry record

Entity type Individual (Type 1)

Name William Stewart

Credential M.D.

Sex Male

Practice address 350 Heritage Way Ste 2300, Kalispell, MT, 59901

Phone (406) 752-8456

Fax (406) 755-1088

Enumeration date Mar 22, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License 7509 (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
0101959	Medicaid	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.

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Frequently asked questions

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.

What specialty is William Stewart?

William Stewart is registered in NPPES with the primary taxonomy of Urology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.