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

Dr. William Henry Castro, M.D., F.A.C.O.G.

Gynecology Physician in Caguas, PR · enumerated 2005.

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

National Provider Identifier

1083610042

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Registry record

Entity type Individual (Type 1)

Name Dr. William Henry Castro

Credential M.D., F.A.C.O.G.

Sex Male

Practice address Caguas, PR, 00725

Phone (787) 653-3126

Enumeration date Jun 23, 2005

Last updated in NPPES Sep 28, 2011

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

Taxonomy & licenses

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

207VG0400X Gynecology Physician Allopathic & Osteopathic Physicians · License 17160 (PR) 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
288747	Medicaid	AZ	-

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 Castro?

The National Provider Identifier (NPI) for William Castro is 1083610042, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Castro practice?

The practice location on file with NPPES is in Caguas, PR. 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 2011-09-28.