Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Guillermo Marrero MD PA

Q: What is the NPI number for Guillermo Marrero MD PA?

The NPI for Guillermo Marrero MD PA is 1477845303, a Type 2 (organization) record in the CMS NPPES registry.

Internal Medicine Physician in Oviedo, FL · enumerated 2011 · authorized official Guillermo Marrero, Director.

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

National Provider Identifier

1477845303

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Registry record

Entity type Organization (Type 2)

Legal business name Guillermo Marrero MD PA

Other name <Unavail>

Practice address 1000 Executive Dr, Suite 1, Oviedo, FL, 32765

Phone (407) 971-1970

Fax (407) 331-4333

Enumeration date May 11, 2011

Last updated in NPPES May 11, 2011

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License ME0074991 (FL) Primary

Authorized official

Name Guillermo Marrero

Title Director

Phone (407) 971-1970

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

Who is the authorized official for Guillermo Marrero MD PA?

NPPES lists Guillermo Marrero (Director) as the authorized official for this organization.

What is the NPI number for Guillermo Marrero MD PA?

The NPI for Guillermo Marrero MD PA is 1477845303, a Type 2 (organization) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-05-11.