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

Dr. Aida M Lizasoain Santiago, MD

General Practice Physician in Rio Piedras, PR · enumerated 2007.

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

National Provider Identifier

1003955501

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Registry record

Entity type Individual (Type 1)

Name Dr. Aida M Lizasoain Santiago

Credential MD

Sex Female

Practice address Rio Piedras, PR, 00925

Phone (787) 764-8937

Fax (787) 767-4763

Enumeration date Feb 5, 2007

Last updated in NPPES Mar 3, 2011

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

Taxonomy & licenses

208D00000X General Practice Physician Allopathic & Osteopathic Physicians · License 12922 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

Where does Aida Lizasoain Santiago practice?

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

What is the NPI number for Aida Lizasoain Santiago?

The National Provider Identifier (NPI) for Aida Lizasoain Santiago is 1003955501, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Policlinica Rio Piedras General Practice Physician · San Juan, PR NPI 1841280534 Norma Prats Lozada Nutritionist · Rio Piedras, PR NPI 1942240049 Luis Rojas Psychiatry Physician · Rio Piedras, PR NPI 1922010065 Brenda Orta Rodriguez Geriatric Physical Therapist · Rio Piedras, PR NPI 1508034935 On Physical Therapy Inc Geriatric Physical Therapist · Rio Piedras, PR NPI 1386921716 Medic Home Infusions Internal Medicine Physician · Rio Piedras, PR NPI 1104252212

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-03-03.