Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Greg A Brown, M.D.

Internal Medicine Physician in San Clemente, CA · enumerated 2007.

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

National Provider Identifier

1720135346

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Registry record

Entity type Individual (Type 1)

Name Dr. Greg A Brown

Credential M.D.

Sex Male

Practice address 655 Camino De Los Mares, Suite 124, San Clemente, CA, 92673

Phone (949) 661-9657

Fax (949) 661-1352

Enumeration date Jan 4, 2007

Last updated in NPPES Dec 16, 2008

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License A40335 (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
A40335	Other	CA	LICENSE
00A403350	Medicaid	CA	-

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.

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Frequently asked questions

How do I verify Greg Brown's NPI record?

Cross-check NPI 1720135346 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1720135346 active?

Yes, as of the latest NPPES snapshot, NPI 1720135346 is active (record last updated 2008-12-16).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-12-16.