Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Jeffrey J Thomas, M.D.

Hospitalist Physician in Walnut Creek, CA · enumerated 2006.

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

National Provider Identifier

1396765111

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Registry record

Entity type Individual (Type 1)

Name Dr. Jeffrey J Thomas

Credential M.D.

Sex Male

Practice address 1220 Rossmoor Pkwy, Walnut Creek, CA, 94595

Phone (925) 947-3393

Fax (925) 947-3396

Enumeration date Jul 21, 2006

Last updated in NPPES Nov 11, 2014

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License A68446 (CA) Secondary

208M00000X Hospitalist Physician Allopathic & Osteopathic Physicians · License A68446 (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
00A684460	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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Jeffrey Thomas practice?

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

What is the NPI number for Jeffrey Thomas?

The National Provider Identifier (NPI) for Jeffrey Thomas is 1396765111, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-11-11.