NPPES file of Aug 9, 2026

Ubaldo G. Santiago Buono, M.D.

Geriatric Medicine (Internal Medicine) Physician · San Juan, PR

Ubaldo G. Santiago Buono, M.D. is a geriatric medicine (internal medicine) physician with a practice address in San Juan, Puerto Rico, and NPI 1104825611, issued on Jul 18, 2005. Check the license (Puerto Rico 13571, 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
1104825611
Name
Ubaldo G. Santiago Buono
Credential
M.D.
Primary taxonomy
Geriatric Medicine (Internal Medicine) Physician 207RG0300X
License number
13571 PR
Self-reported in NPPES; status is on the state search
Practice location
1304 Wilson Street, San Juan, PR 00907
Phone
(787) 536-2033
Enumerated
Jul 18, 2005
Record last updated
Jun 10, 2024
Fax
(787) 722-2374
Medicare enrollment
Enrolled (PECOS I20060509000436); accepts Medicare assignment
Medical or professional school
University Central Del Caribe Escuela De Medicina, 1996
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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8 nearest geriatric medicine (internal medicine) physician records → All 21 in Puerto Rico → Look up another NPI →

Verify Ubaldo G. Santiago Buono 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 13571    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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88% more Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024

8,000 Medicare Part D claims for 753 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 9% of claims. 29 claims were for opioids.

  1. Ubaldo Santiago Buono8,000
  2. Specialty average4,246

Most prescribed

  1. Famotidine550 claims
  2. Atorvastatin Calcium408 claims
  3. Simvastatin339 claims
  4. Metformin Hcl333 claims
  5. Gabapentin300 claims
  6. Losartan Potassium261 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: $526.11

10 payments; by number, the most common kind was food and beverage; the largest payer was Janssen Pharmaceuticals, Inc. The 1,004 providers of this specialty with any payment received $1,720.82 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.

  1. Ubaldo Santiago Buono$526.11
  2. Specialty average$1,720.82

Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.

Ubaldo G. Santiago Buono among 21 geriatric medicine (internal medicine) physician records in Puerto Rico

Ubaldo G. Santiago Buono, M.D. 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 2005, is newer than 0% of them.

  • NPI issued2005 · 0% of these records are older, 90% newer
  • In a Medicare fileYes · 100% of these records are
  • In the CMS Doctors and Clinicians fileYes · 67% of these records are
  • Graduated1996 · median 1993 among the 14 with a school on file
  • Record last updated2024 · 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

  1. Herminio Frontera, M.D.San Juan, PR 009171528126505
  2. William Marrero Ortiz, MDSan Juan, PR 009171619418027
  3. Maritza Carrasquillo, M.D.San Juan, PR 009211609810258
  4. Basilio Santiago Perez, MDSan Juan, PR 009211609897412
  5. Michel Santiago-Berrios, MDSan Juan, PR 009211780164269
  6. Vanessa Sepulveda Rivera, MDSan Juan, PR 009211427199264
  7. Nicole Rassi Stella, MDSan Juan, PR 009221013149145
  8. Cristina Nevarez De Jesus, M.D.San Juan, PR 009261588897755

Common questions

What is Ubaldo G. Santiago Buono, M.D.'s NPI number?

Ubaldo G. Santiago Buono, M.D.'s National Provider Identifier (NPI) is 1104825611, issued on Jul 18, 2005. An NPI identifies a provider in billing; it is not a license.

Where is Ubaldo G. Santiago Buono, M.D. located?

The NPPES record lists a practice address at 1304 Wilson Street, San Juan, PR, 00907. Phone: (787) 536-2033. Providers update this record themselves, so call before visiting.

How can I verify Ubaldo G. Santiago Buono, M.D.'s license?

NPPES lists Puerto Rico license number 13571, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.

How much does Ubaldo G. Santiago Buono, M.D. prescribe under Medicare Part D?

In 2024, Ubaldo G. Santiago Buono, M.D. had 8,000 Medicare Part D claims for 753 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.

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.