NPPES file of Aug 9, 2026

Manuel A. Diaz, M.D.

Addiction Medicine (Psychiatry & Neurology) Physician · Guaynabo, PR

Manuel A. Diaz, M.D. is an addiction medicine (psychiatry & neurology) physician with a practice address in Guaynabo, Puerto Rico, and NPI 1851420004, issued on Mar 5, 2007. Check the license (Puerto Rico 8649, 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
1851420004
Name
Manuel A. Diaz
Credential
M.D.
Primary taxonomy
Addiction Medicine (Psychiatry & Neurology) Physician 2084A0401X
License number
8649 PR
Self-reported in NPPES; status is on the state search
Practice location
Edif Caparra Gallery, Guaynabo, PR 00966
Phone
(787) 531-6840
Enumerated
Mar 5, 2007
Record last updated
Jul 8, 2007 (not updated in 19 years: call before relying on the address or phone)
Fax
(787) 782-4268
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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6 nearest addiction medicine (psychiatry & neurology) physician records → All 7 in Puerto Rico → Look up another NPI →

Verify Manuel A. 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 8649    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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8.5 times the Medicare Part D claims of the average addiction medicine (psychiatry & neurology) physician in 2024

7,408 Medicare Part D claims for 297 beneficiaries, against an average of 870 among the 264 providers of this specialty who prescribed in Part D. Brand-name drugs were under 1% of claims.

  1. Manuel Diaz7,408
  2. Specialty average870

Most prescribed

  1. Clonazepam1,148 claims
  2. Trazodone Hcl787 claims
  3. Temazepam761 claims
  4. Sertraline Hcl631 claims
  5. Fluoxetine Hcl482 claims
  6. Risperidone344 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.

Addiction Medicine (Psychiatry & Neurology) Physician providers in Puerto Rico

There are 7 addiction medicine (psychiatry & neurology) physician records in Puerto Rico.

All 7 in Puerto Rico → Every provider in Guaynabo → Addiction Medicine (Psychiatry & Neurology) Physician nationwide →

The 6 addiction medicine (psychiatry & neurology) physician records with the nearest ZIP codes

  1. Leticia Ubinas, M.D.San Juan, PR 009251740426642
  2. Liliana Rivera-Negron, MDSan Juan, PR 009211366869745
  3. Nicolas Hernandez, M.D.San Juan, PR 009181275637332
  4. Ramon Parrilla, MDCidra, PR 007391689622672
  5. Nelson Valle-Campos, M.D.Mayaguez, PR 006811164644290
  6. Armando Fortuno, M.D.00612, PR 006121578555272

Common questions

What is Manuel A. Diaz, M.D.'s NPI number?

Manuel A. Diaz, M.D.'s National Provider Identifier (NPI) is 1851420004, issued on Mar 5, 2007. An NPI identifies a provider in billing; it is not a license.

Where is Manuel A. Diaz, M.D. located?

The NPPES record lists a practice address at Edif Caparra Gallery, Guaynabo, PR, 00966. Phone: (787) 531-6840. Providers update this record themselves, so call before visiting.

How can I verify Manuel A. Diaz, M.D.'s license?

NPPES lists Puerto Rico license number 8649, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.

How much does Manuel A. Diaz, M.D. prescribe under Medicare Part D?

In 2024, Manuel A. Diaz, M.D. had 7,408 Medicare Part D claims for 297 beneficiaries; the average among addiction medicine (psychiatry & neurology) physician prescribers was 870. 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.