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

Peter James Walsh, M.D.

Mental Health Counselor in Greenbrae, CA · enumerated 2013.

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

National Provider Identifier

1477890846

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Registry record

Entity type Individual (Type 1)
Name Peter James Walsh
Credential M.D.
Sex Male
Practice address Greenbrae, CA, 94904
Phone (415) 461-9247
Enumeration date Jan 5, 2013
Last updated in NPPES Jan 5, 2013

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

Taxonomy & licenses

101YM0800X Mental Health Counselor Behavioral Health & Social Service Providers · License C30448 (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
C30448 Other CA LICENSE

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 is the NPI number for Peter Walsh?
The National Provider Identifier (NPI) for Peter Walsh is 1477890846, a Type 1 (individual) record in the CMS NPPES registry.
Where does Peter Walsh practice?
The practice location on file with NPPES is in Greenbrae, CA. Providers can have multiple locations; NPPES lists the primary practice address.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-01-05.