NPPES file of Aug 9, 2026

Alfredo Ayala Diaz, M.D.

General Practice Physician · San Juan, PR

Alfredo Ayala Diaz, M.D. is a general practice physician with a practice address in San Juan, Puerto Rico, and NPI 1518317692, issued on Jun 20, 2016. Check the license (Puerto Rico 22229, 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
1518317692
Name
Alfredo Ayala Diaz
Credential
M.D.
Primary taxonomy
General Practice Physician 208D00000X
License number
22229 PR
Self-reported in NPPES; status is on the state search
Practice location
150 Jose DE Diego Ave, San Juan, PR 00907
Phone
(787) 230-7557
Enumerated
Jun 20, 2016
Record last updated
Aug 6, 2024
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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8 nearest general practice physician records → All 4,170 in Puerto Rico → Look up another NPI →

Verify Alfredo Ayala Diaz 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 22229    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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93% fewer Medicare Part D claims than the average general practice physician in 2024

197 Medicare Part D claims for 113 beneficiaries, against an average of 3,030 among the 8,395 providers of this specialty who prescribed in Part D.

  1. Alfredo Ayala Diaz197
  2. Specialty average3,030

Most prescribed

  1. Famotidine33 claims
  2. Pantoprazole Sodium22 claims
  3. Azithromycin18 claims
  4. Clindamycin Hcl15 claims
  5. Ketorolac Tromethamine14 claims
  6. Ondansetron Hcl14 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.

Alfredo Ayala Diaz among 4,170 general practice physician records in Puerto Rico

Alfredo Ayala Diaz, M.D. 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 2016, is newer than 63% of them.

  • NPI issued2016 · 63% of these records are older, 36% newer
  • In a Medicare fileYes · 78% of these records are
  • In the CMS Doctors and Clinicians fileNo · 29% of these records are
  • Record last updated2024 · 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).

622 general practice physician records list a practice address in San Juan

They are 622 of the 8,960 NPPES records with a practice address in San Juan, and 4,170 general practice physician records in Puerto Rico.

All 4,170 in Puerto Rico → Every provider in San Juan → General Practice Physician nationwide →

The 8 general practice physician records with the nearest ZIP codes

  1. Alfredo Ayala Marrero, MDSan Juan, PR 009071881658284
  2. Jorge Cabrera-CaraballoSanturce, PR 009071689669004
  3. Ivan Cerezo De La Rosa, MDSan Juan, PR 009071245290956
  4. Jose De Jesus, MD, ODSan Juan, PR 009071114948874
  5. Rafael Hernandez, MDSanturce, PR 009071851319636
  6. Norma Llaguno, M.D.Santurse, PR 009071215925730
  7. Rosa Lopez, M.D.San Juan, PR 009071124068820
  8. Victor Montanez, M.D.San Juan, PR 009071316902299

Common questions

What is Alfredo Ayala Diaz, M.D.'s NPI number?

Alfredo Ayala Diaz, M.D.'s National Provider Identifier (NPI) is 1518317692, issued on Jun 20, 2016. An NPI identifies a provider in billing; it is not a license.

Where is Alfredo Ayala Diaz, M.D. located?

The NPPES record lists a practice address at 150 Jose DE Diego Ave, San Juan, PR, 00907. Phone: (787) 230-7557. Providers update this record themselves, so call before visiting.

How can I verify Alfredo Ayala Diaz, M.D.'s license?

NPPES lists Puerto Rico license number 22229, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.

How much does Alfredo Ayala Diaz, M.D. prescribe under Medicare Part D?

In 2024, Alfredo Ayala Diaz, M.D. had 197 Medicare Part D claims for 113 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.

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.