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

Gary E. Marsh, M.D.

Cardiovascular Disease Physician in Downey, CA · enumerated 2006.

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

National Provider Identifier

1639116296

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Gary E. Marsh

Credential M.D.

Sex Male

Practice address Downey, CA, 90240

Phone (562) 861-0954

Fax (562) 231-1904

Enumeration date Jun 1, 2006

Last updated in NPPES Jul 29, 2011

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

Taxonomy & licenses

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License A20613 (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
110060914	Other	-	RAILROAD
00A206130	Medicaid	CA	-
00A206130	Other	-	BLUE SHIELD ID #

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 Gary Marsh?

Gary Marsh is registered in NPPES with the primary taxonomy of Cardiovascular Disease 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.

Other providers at this practice address

Browse all →

Enrique Robles Family Medicine Physician · Downey, CA NPI 1932155157 John Shaib Nephrology Physician · Downey, CA NPI 1851339048 Marshall Kahn Family Medicine Physician · Downey, CA NPI 1699912451

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-07-29.