Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

William R Holmes, Do

Family Medicine Physician in Lewistown, MT · enumerated 2006 · authorized official Corina Cook, Manager.

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

National Provider Identifier

1801968524

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Registry record

Entity type Organization (Type 2)

Legal business name William R Holmes, Do

Other name <Unavail>

Practice address 310 Wendell Ave, Suite 103, Lewistown, MT, 59457

Phone (406) 535-1480

Fax (406) 535-1481

Enumeration date Nov 15, 2006

Last updated in NPPES Jun 22, 2009

Taxonomy & classification

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Corina Cook

Title Manager

Phone (406) 535-1484

Other identifiers

Identifier	Type	State	Issuer
CG4190	Other	-	RAILROAD MEDICARE

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

Where is William R Holmes, Do located?

The practice location on file with NPPES is in Lewistown, MT.

How current is this record?

Data comes from the CMS NPPES public dissemination file; this record was last updated in NPPES on 2009-06-22. Verify at npiregistry.cms.hhs.gov.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-06-22.