Marco Antonio Alfonso, MD
General Practice Physician · Guayama, PR
Marco Antonio Alfonso, MD is a general practice physician with a practice address in Guayama, Puerto Rico, and NPI 1134811714, issued on May 23, 2023. Check the license (Puerto Rico 023233, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Marco Antonio Alfonso
- Credential
- MD
- Primary taxonomy
- General Practice Physician 208D00000X
- License number
- 023233 PR
Self-reported in NPPES; status is on the state search - Practice location
- Hospital Menonita Guayama, AV. Pedro Albizu Campos, Guayama, PR 00714
- Phone
- (787) 866-6668
- Enumerated
- May 23, 2023
- Record last updated
- May 24, 2023
- Entity
- Type 1 · individual
8 nearest general practice physician records → All 4,170 in Puerto Rico → Look up another NPI →
Verify Marco Antonio Alfonso in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Puerto Rico board licenses this profession
Search for license 023233Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
83% fewer Medicare Part D claims than the average general practice physician in 2024
508 Medicare Part D claims for 209 beneficiaries, against an average of 3,030 among the 8,395 providers of this specialty who prescribed in Part D. Brand-name drugs were 6% of claims.
Most prescribed
- Famotidine62 claims
- Levofloxacin41 claims
- Amoxicillin-Clavulanate Potass29 claims
- Atorvastatin Calcium29 claims
- Carvedilol29 claims
- Furosemide21 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.
Marco Antonio Alfonso among 4,170 general practice physician records in Puerto Rico
Marco Antonio Alfonso, MD is one of 4,170 general practice physician records with a practice address in Puerto Rico. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 90% of them.
- NPI issued2023 · 90% of these records are older, 6% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileNo · 29% of these records are
- Record last updated2023 · 58% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 208D00000X and a Puerto Rico practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
70 general practice physician records list a practice address in Guayama
They are 70 of the 367 NPPES records with a practice address in Guayama, and 4,170 general practice physician records in Puerto Rico.
All 4,170 in Puerto Rico → Every provider in Guayama → General Practice Physician nationwide →
The 8 general practice physician records with the nearest ZIP codes
- Jessica Aguirre PillotArroyo, PR 007141942441316
- Nilda Alvarez, MDArroyo, PR 007141073610333
- Larry Bernier Gonzalez, MDArroyo, PR 007141043230428
- Jose Burgos Gonzalez, MDArroyo, PR 007141184180515
- Fermin De Jesus, MDArroyo, PR 007141710458674
- Lissette Diaz Olmeda, MDArroyo, PR 007141194379750
- Eugenio Gonzalez Castillo, MDArroyo, PR 007141316962921
- Maria Del Carmen Gutierrez Ortiz, MDArroyo, PR 007141871594200
Common questions
What is Marco Antonio Alfonso, MD's NPI number?
Marco Antonio Alfonso, MD's National Provider Identifier (NPI) is 1134811714, issued on May 23, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Marco Antonio Alfonso, MD located?
The NPPES record lists a practice address at Hospital Menonita Guayama, AV. Pedro Albizu Campos, Guayama, PR, 00714. Phone: (787) 866-6668. Providers update this record themselves, so call before visiting.
How can I verify Marco Antonio Alfonso, MD's license?
NPPES lists Puerto Rico license number 023233, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.
How much does Marco Antonio Alfonso, MD prescribe under Medicare Part D?
In 2024, Marco Antonio Alfonso, MD had 508 Medicare Part D claims for 209 beneficiaries; the average among general practice physician prescribers was 3,030. 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.