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

William Matos-Santiago, M.D.

Rheumatology Physician in San Juan, PR · enumerated 2005 · practices at Las Americas Pain Interventional Center Psc.

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

National Provider Identifier

1477536498

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Registry record

Entity type Individual (Type 1)

Name William Matos-Santiago

Credential M.D.

Sex Male

Practice address San Juan, PR, 00918

Phone (787) 756-7730

Fax (787) 754-2472

Enumeration date Nov 23, 2005

Last updated in NPPES May 20, 2014

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

Taxonomy & licenses

207RR0500X Rheumatology Physician Allopathic & Osteopathic Physicians · License 3572 (PR) 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.

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Frequently asked questions

What is the NPI number for William Matos-Santiago?

The National Provider Identifier (NPI) for William Matos-Santiago is 1477536498, a Type 1 (individual) record in the CMS NPPES registry.

Where does William Matos-Santiago practice?

The practice location on file with NPPES is in San Juan, PR. Providers can have multiple locations; NPPES lists the primary practice address.

Other providers at this practice address

Browse all →

Lourdes Feliciano-Nieves Periodontics · San Juan, PR NPI 1003809120 Angel San Miguel Orthodontics and Dentofacial Orthopedics Dentistry · San Juan, PR NPI 1003951849 Mary Wolfe Optometrist · Hato Rey, PR NPI 1013138056 Ricky Gonzalez Endodontics · San Juan, PR NPI 1568740777 Las Americas Pain Interventional Center Psc Pain Clinic/Center · Hato Rey, PR NPI 1437425030 Eduardo Orraca-Colom Chiropractor · San Juan, PR NPI 1063298495

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-05-20.