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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Walter Sam Mazen Jr., M.D.

Obstetrics Physician in Chico, CA · enumerated 2006.

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

National Provider Identifier

1649292624

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Registry record

Entity type Individual (Type 1)
Name Dr. Walter Sam Mazen Jr.
Credential M.D.
Sex Male
Practice address 1665 Esplanade, Chico, CA, 95926
Phone (530) 895-0423
Fax (530) 895-1872
Enumeration date Jul 25, 2006
Last updated in NPPES Mar 7, 2023

Taxonomy & licenses

207VX0000X Obstetrics Physician Allopathic & Osteopathic Physicians · License G45960 (CA) Primary
207VG0400X Gynecology Physician Allopathic & Osteopathic Physicians · License G45960 (CA) Secondary
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
GROO43570 Medicaid CA -
G45960 Other CA CALIFORNIA STATE 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 Walter Mazen?
The National Provider Identifier (NPI) for Walter Mazen is 1649292624, a Type 1 (individual) record in the CMS NPPES registry.
Where does Walter Mazen practice?
The practice location on file with NPPES is in Chico, 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 2023-03-07.