Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. William Robert Mcgregor, M.D.

Surgery Physician in Great Falls, MT · enumerated 2010.

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

National Provider Identifier

1326370123

Verified

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Registry record

Entity type Individual (Type 1)

Name Dr. William Robert Mcgregor

Credential M.D.

Sex Male

Practice address Great Falls, MT, 59405

Phone (406) 727-4070

Enumeration date Feb 3, 2010

Last updated in NPPES Feb 3, 2010

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 3405 (MT) Primary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License 16334-20 (WI) Secondary

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
02-6559	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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does William Mcgregor practice?

The practice location on file with NPPES is in Great Falls, MT. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for William Mcgregor?

The National Provider Identifier (NPI) for William Mcgregor is 1326370123, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2010-02-03.