William Matos-Santiago, M.D.
Rheumatology Physician · San Juan, PR
William Matos-Santiago, M.D. is a rheumatology physician with a practice address in San Juan, Puerto Rico, and NPI 1477536498, issued on Nov 23, 2005. Check the license (Puerto Rico 3572, as entered in NPPES) with the Puerto Rico board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- William Matos-Santiago
- Credential
- M.D.
- Primary taxonomy
- Rheumatology Physician 207RR0500X
- License number
- 3572 PR
Self-reported in NPPES; status is on the state search - Practice location
- LA Torre DE Plaza Las Americas, San Juan, PR 00918
- Phone
- (787) 756-7730
- Enumerated
- Nov 23, 2005
- Record last updated
- May 20, 2014 (not updated in 12 years: call before relying on the address or phone)
- Fax
- (787) 754-2472
- Entity
- Type 1 · individual
8 nearest rheumatology physician records → All 87 in Puerto Rico → Look up another NPI →
Also registered at LA Torre DE Plaza Las Americas
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify William Matos-Santiago 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 3572Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
61% more Medicare Part D claims than the average rheumatology physician in 2024
3,192 Medicare Part D claims for 378 beneficiaries, against an average of 1,978 among the 6,301 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims. 18 claims were for opioids.
Most prescribed
- Methotrexate582 claims
- Diclofenac Sodium336 claims
- Humira(Cf) Pen243 claims
- Sulindac190 claims
- Alendronate Sodium144 claims
- Gabapentin119 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: $53.35
3 payments; by number, the most common kind was food and beverage; the largest payer was Amgen Inc. The 4,486 providers of this specialty with any payment received $8,538.33 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.
William Matos-Santiago among 87 rheumatology physician records in Puerto Rico
William Matos-Santiago, M.D. is one of 87 rheumatology physician records with a practice address in Puerto Rico. 91% 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, 83% newer
- In a Medicare fileYes · 91% of these records are
- In the CMS Doctors and Clinicians fileNo · 79% of these records are
- Record last updated2014 · 69% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RR0500X and a Puerto Rico practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Rheumatology Physician providers in Puerto Rico
There are 87 rheumatology physician records in Puerto Rico.
All 87 in Puerto Rico → Every provider in San Juan → Rheumatology Physician nationwide →
The 8 rheumatology physician records with the nearest ZIP codes
- Paloma Alejandro, M.D.San Juan, PR 009181578820577
- Maria Chirino-Socias, MDSan Juan, PR 009181154405488
- Luis Garcia-Jaunarena, MDSan Juan, PR 009181194820696
- Ricardo Infante, M.D.San Juan, PR 009181003947540
- Sari PomalesSan Juan, PR 009181457318149
- Grissel Rios, M.D.San Juan, PR 009181821072935
- Radames Sierra-ZoritaSan Juan, PR 009181669457875
- Oscar Soto Raices, MDSan Juan, PR 009181962441717
Common questions
What is William Matos-Santiago, M.D.'s NPI number?
William Matos-Santiago, M.D.'s National Provider Identifier (NPI) is 1477536498, issued on Nov 23, 2005. An NPI identifies a provider in billing; it is not a license.
Where is William Matos-Santiago, M.D. located?
The NPPES record lists a practice address at LA Torre DE Plaza Las Americas, San Juan, PR, 00918. Phone: (787) 756-7730. Providers update this record themselves, so call before visiting.
How can I verify William Matos-Santiago, M.D.'s license?
NPPES lists Puerto Rico license number 3572, as entered by the provider. Search the Puerto Rico board that licenses this profession; the NPPES record confirms identity only.
How much does William Matos-Santiago, M.D. prescribe under Medicare Part D?
In 2024, William Matos-Santiago, M.D. had 3,192 Medicare Part D claims for 378 beneficiaries; the average among rheumatology physician prescribers was 1,978. 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.