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

Dr. Nancy Marrero Viera, MD

General Practice Physician in Hatillo, PR · enumerated 2008.

Data current as of Jul 11, 2026 · sourced from CMS NPPES

National Provider Identifier

1134370091

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Registry record

Entity type Individual (Type 1)

Name Dr. Nancy Marrero Viera

Credential MD

Sex Female

Practice address Hatillo, PR, 00659

Phone (787) 820-8082

Fax (787) 262-6611

Enumeration date Oct 8, 2008

Last updated in NPPES Jan 25, 2013

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 17325 (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

Is NPI 1134370091 active?

Yes — as of the latest NPPES snapshot, NPI 1134370091 is active (record last updated 2013-01-25).

How do I verify Nancy Marrero Viera's NPI record?

Cross-check NPI 1134370091 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2013-01-25.