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

Dr. Marian Fowers Martin, PHD

Psychologist in Billings, MT · enumerated 2006.

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

National Provider Identifier

1831293844

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Registry record

Entity type Individual (Type 1)

Name Dr. Marian Fowers Martin

Credential PHD

Sex Female

Practice address Billings, MT, 59101

Phone (406) 252-0011

Fax (406) 245-7074

Enumeration date Sep 11, 2006

Last updated in NPPES Dec 29, 2016

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

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 53 (MT) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD credential

Other identifiers

Identifier	Type	State	Issuer
492557	Medicaid	MT	-
51330	Other	MT	BLUE CROSS BLUE SHIELD

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

How do I verify Marian Martin's NPI record?

Cross-check NPI 1831293844 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1831293844 active?

Yes, as of the latest NPPES snapshot, NPI 1831293844 is active (record last updated 2016-12-29).

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-12-29.