1. Home
  2. Directory
  3. Florida
  4. Oviedo
  5. Internal Medicine
  6. NPI Profile

OVIEDO HEALTHCARE
NPI 1477845303
Internal Medicine in Oviedo, FL

Active since May 11, 2011
1000 EXECUTIVE DR, SUITE 1, OVIEDO, FL 32765(407) 971-1970(407) 331-4333 Get Directions Write a Review

NPPES record last updated: May 11, 2011. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Oviedo Healthcare NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

OVIEDO HEALTHCARE (NPI 1477845303) is a healthcare organization registered as an internal medicine in Oviedo, Florida and active in the NPI registry since May 2011. The organization lists Guillermo Marrero, Director, as its authorized official.

NPPES Registry Identity

NPI1477845303
Entity TypeOrganization
Primary Taxonomy207R00000X
Legal Business NameGUILLERMO MARRERO MD PA
Location Address1000 EXECUTIVE DR, SUITE 1Oviedo, FL 32765-8140
Mailing Address1000 Executive Dr, Suite 1Oviedo, FL 32765-8140 · (407) 971-1970 · Fax (407) 331-4333
Phone(407) 971-1970
Fax(407) 331-4333
Organization SubpartNo
Authorized OfficialGuillermo MarreroDirector · (407) 971-1970
Enumeration DateMay 11, 2011
✔ NPI 1477845303 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in FL · ME0074991
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
1000 EXECUTIVE DR, Oviedo, FL 32765
Open in Google Maps ↗

Other Names 1

Doing Business AsOviedo Healthcare

Other Identifiers 1

Medicare UPING65641FL

Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Oviedo Healthcare is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Oviedo Healthcare, which bills Medicare for the services this clinician delivers.

Clinician (1)

Guillermo Marrero, M.D.
Internal Medicine
NPI 1245211044
1000 EXECUTIVE DR SUITE 1
Oviedo, FL 32765
(407) 971-1970
✔ PECOS✔ Accepts MedicareSame address

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Guillermo Marrero MD PA's NPI number?

The NPI number for Guillermo Marrero MD PA is 1477845303. It was assigned to this organization in the NPPES registry on May 11, 2011. The provider is doing business as Oviedo Healthcare.

Where is Guillermo Marrero MD PA located?

Guillermo Marrero MD PA is located at 1000 Executive Dr Suite 1, Oviedo, FL 32765. The listed phone number is (407) 971-1970.

What is Guillermo Marrero MD PA's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Guillermo Marrero MD PA enrolled in Medicare?

Yes. Guillermo Marrero MD PA is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Guillermo Marrero MD PA?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Internal Medicine) reassigns their Medicare billing to Guillermo Marrero MD PA. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Guillermo Marrero MD PA was last updated on May 11, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.