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

Dr. William I Han, M.D.

Urogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) Physician in Fountain Valley, CA · enumerated 2006 · practices at Daryoosh Samimi MD Inc.

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

National Provider Identifier

1043300114

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Registry record

Entity type Individual (Type 1)
Name Dr. William I Han
Credential M.D.
Sex Male
Practice address Fountain Valley, CA, 92708
Phone (714) 444-3030
Fax (949) 419-2515
Enumeration date Oct 12, 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

207VF0040X Urogynecology and Reconstructive Pelvic Surgery (Obstetrics & Gynecology) Physician Allopathic & Osteopathic Physicians · License A38218 (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
00A382180 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 is the NPI number for William Han?
The National Provider Identifier (NPI) for William Han is 1043300114, a Type 1 (individual) record in the CMS NPPES registry.
Where does William Han practice?
The practice location on file with NPPES is in Fountain Valley, 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.