Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Janet K Armstrong, M.D.

Internal Medicine Physician in Glasgow, MT · enumerated 2006 · practices at Frances Mahon Deaconess Hospital.

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

National Provider Identifier

1215949557

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Registry record

Entity type Individual (Type 1)

Name Janet K Armstrong

Credential M.D.

Sex Female

Practice address 221 5th Ave S, Glasgow, MT, 59230

Phone (406) 228-3400

Enumeration date Aug 13, 2006

Last updated in NPPES Mar 26, 2008

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 6460 (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
0099756	Medicaid	MT	-
P00195095	Other	-	MEDICARE RR
00097980	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.

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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 Janet Armstrong?

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

Other providers at this practice address

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Curtis Settergren Orthopaedic Surgery Physician · Glasgow, MT NPI 1376535153 Frances Mahon Deaconess Hospital Rural Health Clinic/Center · Glasgow, MT NPI 1043266356 James Martin Clinical Psychologist · Glasgow, MT NPI 1225062300 Kari Wiens Family Nurse Practitioner · Glasgow, MT NPI 1740292911 Anne Millard Family Medicine Physician · Glasgow, MT NPI 1780696062 Gordon Bell Family Medicine Physician · Glasgow, MT NPI 1750393914 Anne Williams Surgery Physician · Glasgow, MT NPI 1104937499 Donna Smith Obstetrics & Gynecology Physician · Glasgow, MT NPI 1588700660

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-03-26.