Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Alan Marcus, M.D

Q: What is the NPI number for Alan Marcus?

The National Provider Identifier (NPI) for Alan Marcus is 1275631657, a Type 1 (individual) record in the CMS NPPES registry.

Endocrinology, Diabetes & Metabolism Physician in Laguna Hills, CA · enumerated 2006.

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

National Provider Identifier

1275631657

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Registry record

Entity type Individual (Type 1)

Name Dr. Alan Marcus

Credential M.D

Sex Male

Practice address 24422 Avenida De La Carlota Ste 375, Laguna Hills, CA, 92653

Phone (949) 770-4177

Fax (949) 472-0305

Enumeration date Sep 20, 2006

Last updated in NPPES Nov 14, 2025

Taxonomy & licenses

207RE0101X Endocrinology, Diabetes & Metabolism Physician Allopathic & Osteopathic Physicians · License A39696 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 Alan Marcus practice?

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

What is the NPI number for Alan Marcus?

The National Provider Identifier (NPI) for Alan Marcus is 1275631657, a Type 1 (individual) record in the CMS NPPES registry.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-11-14.