Mervin De Guzman Diaz, MD
General Practice Physician · Humacao, PR
Mervin De Guzman Diaz, MD is a general practice physician with a practice address in Humacao, Puerto Rico, and NPI 1548876121, issued on Sep 19, 2020. Check the license (Puerto Rico 24685, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mervin De Guzman Diaz
- Credential
- MD
- Primary taxonomy
- General Practice Physician 208D00000X
- License number
- 24685 PR
Self-reported in NPPES; status is on the state search - Practice location
- 355 Calle Font Martelo, Humacao, PR 00791
- Phone
- (787) 852-0768
- Enumerated
- Sep 19, 2020
- Record last updated
- May 24, 2026
- Medicare enrollment
- Enrolled (PECOS I20251018000652); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest general practice physician records → All 4,170 in Puerto Rico → Look up another NPI →
Also registered at 355 Calle Font Martelo
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Brenda CruzCase Manager/Care Coordinator1457546038
- Margarita DelgadoCase Manager/Care Coordinator1184817942
- Mayra GarciaCounselor1346433109
Verify Mervin De Guzman Diaz 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 24685Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
98% fewer Medicare Part D claims than the average general practice physician in 2024
58 Medicare Part D claims for 25 beneficiaries, against an average of 3,030 among the 8,395 providers of this specialty who prescribed in Part D.
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: $116.11
1 payment: food and beverage; the largest payer was Genzyme Corporation. The 4,259 providers of this specialty with any payment received $1,273.40 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.
Mervin De Guzman Diaz among 4,170 general practice physician records in Puerto Rico
Mervin De Guzman Diaz, 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 2020, is newer than 73% of them.
- NPI issued2020 · 73% of these records are older, 22% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 29% of these records are
- Graduated2020 · median 2004 among the 1,228 with a school on file
- Record last updated2026 · 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).
91 general practice physician records list a practice address in Humacao
They are 91 of the 723 NPPES records with a practice address in Humacao, and 4,170 general practice physician records in Puerto Rico.
All 4,170 in Puerto Rico → Every provider in Humacao → General Practice Physician nationwide →
The 8 general practice physician records with the nearest ZIP codes
- Alejandro Calvi, MDHumacao, PR 007911821086331
- Carlos Carrion, M.D.Humacao, PR 007911346277407
- Luis Fernandez-Brito, M.D.Humacao, PR 007911487623385
- David Figueroa, M.D.Humacao, PR 007911891755047
- Manuel Guzman, MDHumacao, PR 007911184678948
- Lynneth Mercado Rodriguez, M.DHumacao, PR 007911336126168
- Sharon Millan- Aponte, M.D.Humacao, PR 007911548295314
- Yamilka Navarro Figueroa, MDHumacao, PR 007911902860828
Common questions
What is Mervin De Guzman Diaz, MD's NPI number?
Mervin De Guzman Diaz, MD's National Provider Identifier (NPI) is 1548876121, issued on Sep 19, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Mervin De Guzman Diaz, MD located?
The NPPES record lists a practice address at 355 Calle Font Martelo, Humacao, PR, 00791. Phone: (787) 852-0768. Providers update this record themselves, so call before visiting.
How can I verify Mervin De Guzman Diaz, MD's license?
NPPES lists Puerto Rico license number 24685, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.
How much does Mervin De Guzman Diaz, MD prescribe under Medicare Part D?
In 2024, Mervin De Guzman Diaz, MD had 58 Medicare Part D claims for 25 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.