Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Deborah A Greer, M.D.

Family Medicine Physician in Walnut Creek, CA · enumerated 2006 · practices at John Muir Physician Network.

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

National Provider Identifier

1003851858

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Registry record

Entity type Individual (Type 1)

Name Dr. Deborah A Greer

Credential M.D.

Sex Female

Practice address 1450 Treat Blvd, Suite 160, Walnut Creek, CA, 94597

Phone (925) 296-9000

Fax (925) 296-9071

Enumeration date Jun 17, 2006

Last updated in NPPES Apr 2, 2014

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License A64667 (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
P01019288	Other	CA	RAILROAD MEDICARE
00A646670	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

What is the NPI number for Deborah Greer?

The National Provider Identifier (NPI) for Deborah Greer is 1003851858, a Type 1 (individual) record in the CMS NPPES registry.

Where does Deborah Greer practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-04-02.