Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Spencer K Martin, M.D.

Internal Medicine Physician in Brentwood, CA · enumerated 2007.

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

National Provider Identifier

1942325220

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Registry record

Entity type Individual (Type 1)

Name Dr. Spencer K Martin

Credential M.D.

Sex Female

Practice address 2400 Balfour Rd, Suite 120, Brentwood, CA, 94513

Phone (925) 308-8112

Fax (925) 308-8710

Enumeration date Mar 19, 2007

Last updated in NPPES Jun 21, 2012

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License C53514 (CA) 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
P00824968	Other	CA	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

How do I verify Spencer Martin's NPI record?

Cross-check NPI 1942325220 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1942325220 active?

Yes, as of the latest NPPES snapshot, NPI 1942325220 is active (record last updated 2012-06-21).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-06-21.