Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

William H Castro MD PC

Q: What is the NPI number for William H Castro MD PC?

The NPI for William H Castro MD PC is 1063656114, a Type 2 (organization) record in the CMS NPPES registry.

Gynecology Physician in Glendale, AZ · enumerated 2009 · authorized official William Castro, President.

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

National Provider Identifier

1063656114

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Registry record

Entity type Organization (Type 2)

Legal business name William H Castro MD PC

Practice address 18699 N 67th Ave, Ste 320, Glendale, AZ, 85308

Phone (623) 412-3100

Fax (623) 334-9125

Enumeration date Apr 20, 2009

Last updated in NPPES Apr 20, 2009

Taxonomy & classification

207VG0400X Gynecology Physician Allopathic & Osteopathic Physicians · License 18402 (AZ) Primary

Authorized official

Name William Castro

Title President

Phone (623) 412-3100

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 William H Castro MD PC?

The NPI for William H Castro MD PC is 1063656114, a Type 2 (organization) record in the CMS NPPES registry.

Who is the authorized official for William H Castro MD PC?

NPPES lists William Castro (President) as the authorized official for this organization.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2009-04-20.