Elfren F. Rios Santiago, M.D.
NPI 1336124627ActiveIndividual· Family Medicine· Dorado, PR
Family Medicine (M.D.) in Dorado, Puerto Rico, licensed in PR, with an NPI issued in December 2005. Their prescriptions cost Medicare Part D more than their services did: $86,515 for 1,529 claims, against $2,449 paid for services in 2024. Merck Sharp & Dohme LLC reported $125.94 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1336124627 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Dec 9, 2005 |
| Last updated in NPPES | Nov 1, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 7399 | PR |
| Acupuncturist | 171100000X | 62 | PR |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Family Practice (PR) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 22 |
|---|---|
| Services billed | 72 across 3 procedure codes |
| Paid by Medicare | $2,449 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,529 · 2,350 30-day fills |
|---|---|
| Patients | 191 |
| Total drug cost | $86,515 |
| Generic share | 85% of claims |
Education and affiliations
| Graduation year | 1980 |
|---|---|
| Medicare specialty | Family Practice |
Industry payments (Open Payments)
- 2025$125.94 · 2 payments from 1 company
- 2024$249.50 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Merck Sharp & Dohme LLC | $125.94 | 2 |
What the 2025 payments were for
- Food and Beverage$125.94 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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