Guillermo A. Alvarez, MD
Internal Medicine Physician · Moca, PR
Guillermo A. Alvarez, MD is an internal medicine physician with a practice address in Moca, Puerto Rico, and NPI 1063820355, issued on Jul 30, 2014. Check the license (Puerto Rico 18845, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Guillermo A. Alvarez
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 18845 PR
Self-reported in NPPES; status is on the state search - Practice location
- Moca Medical Plaza, Moca, PR 00676
- Phone
- (787) 877-6103
- Enumerated
- Jul 30, 2014
- Record last updated
- Jan 2, 2024
- Fax
- (787) 877-9400
- Medicare enrollment
- Enrolled (PECOS I20150901000123); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 1,146 in Puerto Rico → Look up another NPI →
Verify Guillermo A. Alvarez 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 18845Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
57% fewer Medicare Part D claims than the average internal medicine physician in 2024
1,352 Medicare Part D claims for 248 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. 15 claims were for opioids.
Most prescribed
- Atorvastatin Calcium90 claims
- Losartan Potassium58 claims
- Metoprolol Succinate55 claims
- Lisinopril54 claims
- Famotidine53 claims
- Gabapentin49 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.
Industry payments in 2024: $125.00
1 payment: food and beverage; the largest payer was Boehringer Ingelheim Pharmaceuticals, Inc. The 50,334 providers of this specialty with any payment received $1,303.06 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.
Guillermo A. Alvarez among 1,146 internal medicine physician records in Puerto Rico
Guillermo A. Alvarez, MD is one of 1,146 internal medicine physician records with a practice address in Puerto Rico. 79% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2014, is newer than 67% of them.
- NPI issued2014 · 67% of these records are older, 31% newer
- In a Medicare fileYes · 79% of these records are
- In the CMS Doctors and Clinicians fileYes · 52% of these records are
- Graduated2004 · median 1996 among the 595 with a school on file
- Record last updated2024 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Puerto Rico practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
9 internal medicine physician records list a practice address in Moca
They are 9 of the 339 NPPES records with a practice address in Moca, and 1,146 internal medicine physician records in Puerto Rico.
All 1,146 in Puerto Rico → Every provider in Moca → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Xavier Colon Rivera, M.D.Moca, PR 006761699152140
- Sara Colon Santiago, MDMoca, PR 006761871836643
- Mario Hilerio Ramos, M.D.Moca, PR 006761134534035
- Mirelis Miranada GallozaMoca, PR 006761659447514
- Francisco Rodriguez, MDMoca, PR 006761710161104
- Yadira Rodriguez Vargas, MDMoca, PR 006761649454935
- Angel Romero Santiago, MDMoca, PR 006761780765594
- Oscar Vale Colon, M.D.Moca, PR 006761841289451
Common questions
What is Guillermo A. Alvarez, MD's NPI number?
Guillermo A. Alvarez, MD's National Provider Identifier (NPI) is 1063820355, issued on Jul 30, 2014. An NPI identifies a provider in billing; it is not a license.
Where is Guillermo A. Alvarez, MD located?
The NPPES record lists a practice address at Moca Medical Plaza, Moca, PR, 00676. Phone: (787) 877-6103. Providers update this record themselves, so call before visiting.
How can I verify Guillermo A. Alvarez, MD's license?
NPPES lists Puerto Rico license number 18845, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.
How much does Guillermo A. Alvarez, MD prescribe under Medicare Part D?
In 2024, Guillermo A. Alvarez, MD had 1,352 Medicare Part D claims for 248 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.