Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Michael Stephen Baker, M.D.

Surgery Physician in Walnut Creek, CA · enumerated 2006.

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

National Provider Identifier

1043309008

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Registry record

Entity type Individual (Type 1)

Name Dr. Michael Stephen Baker

Credential M.D.

Sex Male

Practice address 130 La Casa Via, Building 3, Suite 211, Walnut Creek, CA, 94598

Phone (925) 933-0984

Fax (925) 988-0986

Enumeration date Oct 11, 2006

Last updated in NPPES Jul 23, 2021

Taxonomy & licenses

174400000X Specialist Other Service Providers · License G31440 (CA) Secondary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License G31440 (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
00G314400	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

What specialty is Michael Baker?

Michael Baker is registered in NPPES with the primary taxonomy of Surgery Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-07-23.