Guillermo Marrero, M.D.
Internal Medicine Physician · Oviedo, FL
Guillermo Marrero, M.D. is an internal medicine physician with a practice address in Oviedo, Florida, and NPI 1245211044, issued on Nov 9, 2005. Check the license (Florida ME0074991, as entered in NPPES) on the Florida health license search; the Medicare figures below come from public CMS files.
- Name
- Guillermo Marrero
- Credential
- M.D.
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- ME0074991 FL
Self-reported in NPPES; status is on the state search - Practice location
- 1000 Executive Dr, Oviedo, FL 32765
- Phone
- (407) 971-1970
- Enumerated
- Nov 9, 2005
- Record last updated
- Sep 22, 2010 (not updated in 16 years: call before relying on the address or phone)
- Medicaid ID
- 26328 11 00 FL
- Medicare enrollment
- Enrolled (PECOS I20120628000164); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 10,151 in Florida → Look up another NPI →
Also registered at 1000 Executive Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Jean Patrick Florestal, L M TMassage Therapist1689790057
- Marcey Gold, LMHCMental Health Counselor1932170016
- Joseph Salg, LMHCMental Health Counselor1336111723
- Marjorie Wilde, M.S., LMHCMental Health Counselor1124186382
Verify Guillermo Marrero in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersFlorida health license search
Search for license ME0074991Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
47% more Medicare Part D claims than the average internal medicine physician in 2024
4,673 Medicare Part D claims for 283 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 90 claims were for opioids.
Most prescribed
- Rosuvastatin Calcium285 claims
- Levothyroxine Sodium197 claims
- Amlodipine Besylate193 claims
- Atorvastatin Calcium165 claims
- Losartan Potassium103 claims
- Carvedilol99 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $384.83
17 payments; by number, the most common kind was food and beverage; the largest payer was AstraZeneca Pharmaceuticals LP. The 50,334 providers of this specialty with any payment received $1,303.06 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Guillermo Marrero among 10,151 internal medicine physician records in Florida
Guillermo Marrero, M.D. is one of 10,151 internal medicine physician records with a practice address in Florida. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2005, is newer than 0% of them.
- NPI issued2005 · 0% of these records are older, 90% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 65% of these records are
- Graduated1993 · median 2004 among the 6,606 with a school on file
- Record last updated2010 · 48% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Florida practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
15 internal medicine physician records list a practice address in Oviedo
They are 15 of the 1,250 NPPES records with a practice address in Oviedo, and 10,151 internal medicine physician records in Florida.
All 10,151 in Florida → Every provider in Oviedo → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Adolfo Aldape, M.D.Oviedo, FL 327651598765091
- Zulma Cintron, M.D.Oviedo, FL 327651780671743
- Paola Cruz Chery, MDOviedo, FL 327651629452719
- Mihir Faldu, M.D.Oviedo, FL 327651033371273
- Juliana Giraldo-RamirezOviedo, FL 327651386176030
- Syed Hassan, MDOviedo, FL 327651710935879
- Kirk Hutjens, MDOviedo, FL 327651376650895
- Richard Nelson, MDOviedo, FL 327651205890233
Common questions
What is Guillermo Marrero, M.D.'s NPI number?
Guillermo Marrero, M.D.'s National Provider Identifier (NPI) is 1245211044, issued on Nov 9, 2005. An NPI identifies a provider in billing; it is not a license.
Where is Guillermo Marrero, M.D. located?
The NPPES record lists a practice address at 1000 Executive Dr, Oviedo, FL, 32765. Phone: (407) 971-1970. Providers update this record themselves, so call before visiting.
How can I verify Guillermo Marrero, M.D.'s license?
NPPES lists Florida license number ME0074991, as entered by the provider. Search the Florida health license search at https://mqa-internet.doh.state.fl.us/mqasearchservices/healthcareproviders. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Guillermo Marrero, M.D. prescribe under Medicare Part D?
In 2024, Guillermo Marrero, M.D. had 4,673 Medicare Part D claims for 283 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.