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James Francis Leoni, M.D.

Family Medicine Physician in Petaluma, CA · enumerated 2006.

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

National Provider Identifier

1205936861

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Registry record

Entity type Individual (Type 1)
Name James Francis Leoni
Credential M.D.
Sex Male
Practice address 104 Lynch Creek Way, Ste 10, Petaluma, CA, 94954
Phone (707) 782-9123
Fax (707) 782-9622
Enumeration date Sep 24, 2006
Last updated in NPPES Feb 8, 2012

Taxonomy & licenses

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians · License G56154 (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
00G561540 Other CA BS OF CALIFORNIA
P00469225 Other - RR MEDICARE
1205936861 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

Where does James Leoni practice?
The practice location on file with NPPES is in Petaluma, CA. Providers can have multiple locations; NPPES lists the primary practice address.
What is the NPI number for James Leoni?
The National Provider Identifier (NPI) for James Leoni is 1205936861, 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 2012-02-08.