Carlos C. Maestre-Fernandez, M.D.
Specialist · San Juan, PR
Carlos C. Maestre-Fernandez, M.D. is a specialist with a practice address in San Juan, Puerto Rico, and NPI 1346292042, issued on May 17, 2006. Check the license (Puerto Rico 3276, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Carlos C. Maestre-Fernandez
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- 3276 PR
Self-reported in NPPES; status is on the state search - Practice location
- #6 U3 Carr 21, San Juan, PR 00921
- Phone
- (787) 793-6867
- Enumerated
- May 17, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (787) 782-1565
- Entity
- Type 1 · individual
8 nearest specialist records → All 574 in Puerto Rico → Look up another NPI →
Verify Carlos C. Maestre-Fernandez 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 3276Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
64% fewer Medicare Part D claims than the average specialist in 2024
495 Medicare Part D claims for 62 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. Brand-name drugs were 3% of claims.
Most prescribed
- Alendronate Sodium89 claims
- Bicalutamide55 claims
- Tamsulosin Hcl35 claims
- Pantoprazole Sodium34 claims
- Temazepam22 claims
- Oxybutynin Chloride Er18 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.
Carlos C. Maestre-Fernandez among 574 specialist records in Puerto Rico
Carlos C. Maestre-Fernandez, M.D. is one of 574 specialist records with a practice address in Puerto Rico. 54% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 17% of them.
- NPI issued2006 · 17% of these records are older, 37% newer
- In a Medicare fileYes · 54% of these records are
- In the CMS Doctors and Clinicians fileNo · 26% of these records are
- Record last updated2026 · 79% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Puerto Rico practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
162 specialist records list a practice address in San Juan
They are 162 of the 8,960 NPPES records with a practice address in San Juan, and 574 specialist records in Puerto Rico.
All 574 in Puerto Rico → Every provider in San Juan → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Ariel Cabrera, M.D.San Juan, PR 009211295789915
- Brenda Cardona, O.T.San Juan, PR 009211457561474
- Samari Carrasquillo, O.TSan Juan, PR 009211679783682
- Carmen De Jesus Rivera, MDSan Juan, PR 009211023021581
- Carmen Lopez, M.D.San Juan, PR 009211215092028
- Luis Negron, M.D.San Juan, PR 009211891850608
- Marco Rivera, M.D.San Juan, PR 009211821052291
- Luis Rivera, M.D.San Juan, PR 009211376608984
Common questions
What is Carlos C. Maestre-Fernandez, M.D.'s NPI number?
Carlos C. Maestre-Fernandez, M.D.'s National Provider Identifier (NPI) is 1346292042, issued on May 17, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Carlos C. Maestre-Fernandez, M.D. located?
The NPPES record lists a practice address at #6 U3 Carr 21, San Juan, PR, 00921. Phone: (787) 793-6867. Providers update this record themselves, so call before visiting.
How can I verify Carlos C. Maestre-Fernandez, M.D.'s license?
NPPES lists Puerto Rico license number 3276, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.
How much does Carlos C. Maestre-Fernandez, M.D. prescribe under Medicare Part D?
In 2024, Carlos C. Maestre-Fernandez, M.D. had 495 Medicare Part D claims for 62 beneficiaries; the average among specialist prescribers was 1,380. 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.