NPPES file of Aug 9, 2026

Maria L. Alonso, M.D.

Geriatric Medicine (Family Medicine) Physician · San Juan, PR

Maria L. Alonso, M.D. is a geriatric medicine (family medicine) physician with a practice address in San Juan, Puerto Rico, and NPI 1912921172, issued on Jul 27, 2006. Check the license (Puerto Rico 11128, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1912921172
Name
Maria L. Alonso
Credential
M.D.
Primary taxonomy
Geriatric Medicine (Family Medicine) Physician 207QG0300X
License number
11128 PR
Self-reported in NPPES; status is on the state search
Practice location
10 Calle Casia, San Juan, PR 00921
Phone
(787) 641-7582
Enumerated
Jul 27, 2006
Record last updated
Dec 19, 2016 (not updated in 10 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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Also registered at 10 Calle Casia

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Rosemarie AcevedoRegistered Dietitian1174984306
  2. Brian Acevedo Fuentes, MDStudent in an Organized Health Care Education/Training Program1770422941
  3. Sonia Adrover, MSWClinical Social Worker1710912324
  4. Miguel Agosto EncarnacionPharmacy Technician1891653259
  5. Jose Alamo, D.M.D.General Practice Dentistry1235143322
  6. Karlya Alejandro, PSY.DClinical Psychologist1780956276

Verify Maria L. Alonso in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersWhich Puerto Rico board licenses this profession
    Search for license 11128    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Find the Puerto Rico license search

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96% fewer Medicare Part D claims than the average geriatric medicine (family medicine) physician in 2024

200 Medicare Part D claims for 22 beneficiaries, against an average of 5,222 among the 1,271 providers of this specialty who prescribed in Part D. Brand-name drugs were 23% of claims.

  1. Maria Alonso200
  2. Specialty average5,222

Most prescribed

  1. Jardiance18 claims
  2. Atorvastatin Calcium15 claims
  3. Synthroid15 claims
  4. Nifedipine Er13 claims
  5. Telmisartan13 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.

Geriatric Medicine (Family Medicine) Physician providers in Puerto Rico

There are 64 geriatric medicine (family medicine) physician records in Puerto Rico.

All 64 in Puerto Rico → Every provider in San Juan →

Other geriatric medicine (family medicine) physician records in Puerto Rico

  1. Luz Acevedo-Vargas, MDCarolina, PR1730176595
  2. Marialix Alexandrino De Jesus, M.D.San Juan, PR1407296056
  3. Javier Anaya Gonzalez, MDCarolina, PR1770726150
  4. Sissi Barreto, MDLuquillo, PR1295704260
  5. Alfredo Beauchamp, M.D.Caguas, PR1821046939
  6. Keydi Betancourt GonzalezGurabo, PR1457704322
  7. Nashda Burgos-Muniz, MDSan Juan, PR1700576626
  8. Jose Camunas-Colon, MDCarolina, PR1639619281
  9. Carlos Cestero, M.DSan Juan, PR1619299583
  10. Sergio Chevere Mourino, M.D.Ponce, PR1528038973

Common questions

What is Maria L. Alonso, M.D.'s NPI number?

Maria L. Alonso, M.D.'s National Provider Identifier (NPI) is 1912921172, issued on Jul 27, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Maria L. Alonso, M.D. located?

The NPPES record lists a practice address at 10 Calle Casia, San Juan, PR, 00921. Phone: (787) 641-7582. Providers update this record themselves, so call before visiting.

How can I verify Maria L. Alonso, M.D.'s license?

NPPES lists Puerto Rico license number 11128, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.

How much does Maria L. Alonso, M.D. prescribe under Medicare Part D?

In 2024, Maria L. Alonso, M.D. had 200 Medicare Part D claims for 22 beneficiaries; the average among geriatric medicine (family medicine) physician prescribers was 5,222. 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.