Basilio Santiago Perez, MD
Geriatric Medicine (Internal Medicine) Physician · San Juan, PR
Basilio Santiago Perez, MD is a geriatric medicine (internal medicine) physician with a practice address in San Juan, Puerto Rico, and NPI 1609897412, issued on Jul 21, 2006. Check the license (Puerto Rico 8177, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Basilio Santiago Perez
- Credential
- MD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License number
- 8177 PR
Self-reported in NPPES; status is on the state search - Practice location
- 10 Calle Casia, San Juan, PR 00921
- Phone
- (787) 641-7582
- Enumerated
- Jul 21, 2006
- Record last updated
- Jun 24, 2011 (not updated in 15 years: call before relying on the address or phone)
- Fax
- (787) 641-8369
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 21 in Puerto Rico → Look up another NPI →
Also registered at 10 Calle Casia
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sonia Adrover, MSWClinical Social Worker1710912324
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- Karlya Alejandro, PSY.DClinical Psychologist1780956276
Verify Basilio Santiago Perez 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 8177Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
97% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
136 Medicare Part D claims for 17 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 15% of 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.
Basilio Santiago Perez among 21 geriatric medicine (internal medicine) physician records in Puerto Rico
Basilio Santiago Perez, MD is one of 21 geriatric medicine (internal medicine) physician records with a practice address in Puerto Rico. 100% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 62% newer
- In a Medicare fileYes · 100% of these records are
- In the CMS Doctors and Clinicians fileNo · 67% of these records are
- Record last updated2011 · 52% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Puerto Rico practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Puerto Rico
There are 21 geriatric medicine (internal medicine) physician records in Puerto Rico.
All 21 in Puerto Rico → Every provider in San Juan → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Maritza Carrasquillo, M.D.San Juan, PR 009211609810258
- Michel Santiago-Berrios, MDSan Juan, PR 009211780164269
- Vanessa Sepulveda Rivera, MDSan Juan, PR 009211427199264
- Nicole Rassi Stella, MDSan Juan, PR 009221013149145
- Herminio Frontera, M.D.San Juan, PR 009171528126505
- William Marrero Ortiz, MDSan Juan, PR 009171619418027
- Cristina Nevarez De Jesus, M.D.San Juan, PR 009261588897755
- Ubaldo Santiago Buono, M.D.San Juan, PR 009071104825611
Common questions
What is Basilio Santiago Perez, MD's NPI number?
Basilio Santiago Perez, MD's National Provider Identifier (NPI) is 1609897412, issued on Jul 21, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Basilio Santiago Perez, MD located?
The NPPES record lists a practice address at 10 Calle Casia, San Juan, PR, 00921. Phone: (787) 641-7582. Providers update this record themselves, so call before visiting.
How can I verify Basilio Santiago Perez, MD's license?
NPPES lists Puerto Rico license number 8177, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.
How much does Basilio Santiago Perez, MD prescribe under Medicare Part D?
In 2024, Basilio Santiago Perez, MD had 136 Medicare Part D claims for 17 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. 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.