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

Mrs. Marietta Marzan-Tan, MD

Obstetrics & Gynecology Physician in Bakersfield, CA · enumerated 2006 · practices at San Dimas Medical Group, Inc.

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

National Provider Identifier

1336127372

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Registry record

Entity type Individual (Type 1)

Name Mrs. Marietta Marzan-Tan

Credential MD

Sex Female

Practice address Bakersfield, CA, 93311

Phone (661) 663-4800

Fax (661) 663-4871

Enumeration date Jan 9, 2006

Last updated in NPPES Jul 21, 2022

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

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License A32889 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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 Marietta Marzan-Tan?

The National Provider Identifier (NPI) for Marietta Marzan-Tan is 1336127372, a Type 1 (individual) record in the CMS NPPES registry.

Where does Marietta Marzan-Tan practice?

The practice location on file with NPPES is in Bakersfield, 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 2022-07-21.