Dr. William Matos-Santiago, MD
- Medicare services, 2023
- 53
- Medicare patients, 2024
- 16
- Part D claims, 2024
- 3,192
- Industry payments
- $8,598
- State license
- 1
- Practice address
- 435 Ave Ponce De Leon, San Juan, PR 00917
- Practice phone
- Call (787) 756-7730
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Matos-Santiago's professional email, personal email and mobile number
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Dr. William Matos-Santiago is a rheumatologist in San Juan, Puerto Rico
Dr. Matos-Santiago practices in San Juan, Puerto Rico.
Dr. Matos-Santiago's NPI, 1477536498, was assigned on November 23, 2005. Dr. Matos-Santiago holds Puerto Rico license 3572.
- NPI
- 1477536498NPI Registry (opens in a new tab)
- NPI enumeration date
- November 23, 2005
- NPI status
- Active
- Practice phone
- (787) 756-7730
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
Sources: NPPES NPI Registry (CMS); and Dmand AI Professional Profile Data
Dr. William Matos-Santiago's practice address is in San Juan, Puerto Rico
Dr. Matos-Santiago's practice address in the NPI Registry is 435 Ave Ponce De Leon, San Juan, PR 00917, in San Juan County. The practice phone is (787) 756-7730.
- NPI Registry address435 Ave Ponce De Leon, San Juan, PR 00917 · San Juan CountyPhone(787) 756-7730
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dmand AI tracks the EHR system at Dr. William Matos-Santiago's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Matos-Santiago practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dr. Matos-Santiago's practice | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. William Matos-Santiago is one of 74 rheumatologists in Puerto Rico
Rheumatology is Dr. Matos-Santiago's primary specialty in the NPI Registry, under taxonomy code 207RR0500X. Dr. Matos-Santiago is licensed in Puerto Rico.
Specialties and state licenses
- Rheumatology, Puerto RicoPrimary
Rheumatologists near Dr. Matos-Santiago
Counts of rheumatologists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. William Matos-Santiago billed Medicare for 53 services in 2023
CMS data shows 53 Medicare services from Dr. Matos-Santiago across 2 procedure codes in 2023, all of them office visits, for 16 Medicare patients. Medicare paid $4,394 for them. Every service was in an office.
Dr. Matos-Santiago's Medicare services by type, 2022 to 2023
- 2022
- 2023
- Office and hospital visits
- 2022: 592023: 5310%
Dr. Matos-Santiago compared with the Puerto Rico median for rheumatologists, 2023
- Dr. Matos-Santiago
- Puerto Rico median
- Medicare services
- 53vs 589% below
- Medicare patients
- 16vs 3250% below
- Part D claims
- 2,920vs 3,73022% below
Medians across 78 rheumatologists in Puerto Rico with Dmand AI profiles that report each measure.
Dr. Matos-Santiago's most billed Medicare procedure codes, 2023
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. William Matos-Santiago treated 16 Medicare patients in 2024, average age 78
CMS counts 16 Medicare patients who saw Dr. Matos-Santiago in 2024. The largest group is under 65, with 0 patients. 75% of them have arthritis, and 75% have high blood pressure. Their average risk score is 1.27, where 1.00 is the Medicare average.
Dr. Matos-Santiago's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Matos-Santiago's Medicare patients, 2024
- Arthritis75%
- High blood pressure75%
- High cholesterol75%
Share of Medicare patients with each condition. A patient can have several.
Source: Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. William Matos-Santiago wrote 3,192 Medicare Part D claims in 2024
In 2024, Dr. Matos-Santiago wrote 3,192 Medicare Part D claims for 378 patients. 79% of them were for generic drugs. CMS names the drug for 2,920 of them, across 51 drugs with 11 or more claims each, at $3,499,843 in total drug cost. In 2023, CMS named 6,313 claims across 72 drugs.
Dr. Matos-Santiago's Part D claims by kind of drug, 2024
- Generic2,526 claims79%
- Brand-name666 claims21%
Dr. Matos-Santiago's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Matos-Santiago's Part D claims, 2024
- Opioids1%18 of 3,192 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 6,3132024: 2,92054%
Drugs named by CMS: 51 in 2024, 72 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
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Dr. William Matos-Santiago received $8,598 in industry payments from 2016 to 2024
CMS Open Payments shows 346 general payments to Dr. Matos-Santiago from 16 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 78% of the total. Merck Sharp & Dohme Corporation paid the most, $1,763.
General payments to Dr. Matos-Santiago by program year, 2016 to 2024
General payments to Dr. Matos-Santiago by kind, 2016 to 2024
- Food and beverage$6,67978%
- Speaker and faculty fees$1,50017%
- Consulting fees$4005%
- Education$180%
Companies that paid Dr. Matos-Santiago the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Dr. William Matos-Santiago's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Medicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. William Matos-Santiago
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What is Dr. William Matos-Santiago's NPI number?
Dr. William Matos-Santiago's NPI number is 1477536498. It was assigned on November 23, 2005, and it is active in the NPI Registry.
What kind of doctor is Dr. William Matos-Santiago?
Dr. William Matos-Santiago is a rheumatologist in San Juan, Puerto Rico. The primary specialty in the NPI Registry is Rheumatology Physician (taxonomy code 207RR0500X).
Where does Dr. William Matos-Santiago practice?
Dr. Matos-Santiago practices at 435 Ave Ponce De Leon, San Juan, PR 00917.
What is Dr. William Matos-Santiago's office phone number?
The practice phone on file for Dr. Matos-Santiago is (787) 756-7730.
What is Dr. William Matos-Santiago's medical license number?
Dr. Matos-Santiago holds Puerto Rico license 3572.
Does Dr. William Matos-Santiago accept Medicare?
Yes. CMS data shows Dr. Matos-Santiago billed Medicare for 53 services in 2023.
How many Medicare patients does Dr. William Matos-Santiago see?
CMS counts 16 Medicare patients who saw Dr. Matos-Santiago in 2024, with an average age of 78.
What services does Dr. William Matos-Santiago bill to Medicare?
In 2023, Dr. Matos-Santiago's most billed Medicare services were office visit, established patient (99213) and office visit, established patient (99214).
What drugs does Dr. William Matos-Santiago prescribe most?
In 2024 Medicare Part D data, Dr. Matos-Santiago's most prescribed drugs by claims were Methotrexate, Diclofenac Sodium and Humira(Cf) Pen.
Has Dr. William Matos-Santiago received payments from drug or device companies?
CMS Open Payments shows $8,598 in general payments to Dr. Matos-Santiago from 16 companies from 2016 to 2024. The largest total came from Merck Sharp & Dohme Corporation.
How long has Dr. William Matos-Santiago been practicing?
Dr. Matos-Santiago's NPI was assigned in 2005.
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