Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marilyn F. Grams, MD

Geriatric Medicine (Internal Medicine) Physician in Billings, MT · enumerated 2006 · practices at Billings Clinic Pharmacy.

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

National Provider Identifier

1669492104

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Registry record

Entity type Individual (Type 1)

Name Marilyn F. Grams

Credential MD

Sex Female

Practice address 2825 8th Ave N, Billings, MT, 59101

Phone (406) 238-2500

Enumeration date Jul 20, 2006

Last updated in NPPES Apr 23, 2019

Taxonomy & licenses

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License 8742023-1205 (UT) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License M-14661 (ID) Secondary

207RG0300X Geriatric Medicine (Internal Medicine) Physician Allopathic & Osteopathic Physicians · License 10557 (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
000097204	Other	MT	BCBS PIN
0068770	Other	MT	MDCD PIN
000097205	Other	MT	BCBS PI

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 Marilyn Grams?

Marilyn Grams is registered in NPPES with the primary taxonomy of Geriatric Medicine (Internal 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 2019-04-23.