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

Gary Slesing Feigenbaum, MD

Hospitalist Physician in Santa Monica, CA · enumerated 2013.

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

National Provider Identifier

1558604256

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Registry record

Entity type Individual (Type 1)

Name Gary Slesing Feigenbaum

Credential MD

Sex Male

Practice address Santa Monica, CA, 90404

Phone (310) 319-4698

Fax (310) 206-3260

Enumeration date Apr 1, 2013

Last updated in NPPES Feb 21, 2017

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

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License A133392 (CA) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License A133392 (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
GF3232267556	Other	CA	USC

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 Gary Feigenbaum's NPI record?

Cross-check NPI 1558604256 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1558604256 active?

Yes, as of the latest NPPES snapshot, NPI 1558604256 is active (record last updated 2017-02-21).

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Umesh Bhagia Surgery Physician · Santa Monica, CA NPI 1568468528 Regents of the Univ of California General Acute Care Hospital · Santa Monica, CA NPI 1427055839 Jj&R Emergency Medical Group of California, Inc. Emergency Medicine Physician · Santa Monica, CA NPI 1497704738 Genady Shilyansky Anesthesiology Physician · Santa Monica, CA NPI 1841248564 Zachary Lutsky Emergency Medicine Physician · Santa Monica, CA NPI 1528019205 Walid Ghurabi Emergency Medicine Physician · Santa Monica, CA NPI 1073566931 Michelle Charfen Emergency Medicine Physician · Santa Monica, CA NPI 1588602486 Susan Bukata Orthopaedic Surgery Physician · Santa Monica, CA NPI 1932140639

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2017-02-21.