Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Stephen S Marmer, M.D.

Psychiatry Physician in Los Angeles, CA · enumerated 2007.

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

National Provider Identifier

1891993309

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Registry record

Entity type Individual (Type 1)

Name Mr. Stephen S Marmer

Credential M.D.

Sex Male

Practice address 11611 San Vicente Blvd, Suite 510, Los Angeles, CA, 90049

Phone (310) 820-4990

Fax (310) 207-7103

Enumeration date Jul 5, 2007

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

2084P0800X Psychiatry Physician Allopathic & Osteopathic Physicians · License G18313 (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
G18313	Other	CA	STATE LICENSE

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

Where does Stephen Marmer practice?

The practice location on file with NPPES is in Los Angeles, CA. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Stephen Marmer?

The National Provider Identifier (NPI) for Stephen Marmer is 1891993309, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.