Grissel Rios, M.D.
NPI 1821072935ActiveIndividual· Internal Medicine, Rheumatology· San Juan, PR
Internal Medicine, Rheumatology (M.D.) in San Juan, Puerto Rico, trained at University of Puerto Rico School of Medicine (class of 1996). Their prescriptions cost Medicare Part D more than their services did: $4,664,255 for 8,215 claims, against $10,638 paid for services in 2024. Argenx US, Inc. was the largest of 11 companies reporting payments in 2025, $4,203 in all, mostly travel and lodging.
Overview
| NPI | 1821072935 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Dec 1, 2005 |
| Last updated in NPPES | Feb 10, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | 13344 | PR |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Rheumatology (PR) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 81 |
|---|---|
| Services billed | 158 across 7 procedure codes |
| Paid by Medicare | $10,638 |
Part D prescriptions in 2024
| Prescriptions (claims) | 8,215 · 9,532 30-day fills |
|---|---|
| Patients | 655 |
| Total drug cost | $4,664,255 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | University of Puerto Rico School of Medicine |
|---|---|
| Graduation year | 1996 |
| Medicare specialty | Rheumatology |
| Secondary specialties | Internal Medicine |
Medical group
- Recinto de Ciencias MedicasCarolina, PR · 247 clinicians
Hospital affiliation
- Auxilio Mutuo HospitalSan Juan, PR
Industry payments (Open Payments)
- 2025$4,203 · 36 payments from 11 companies
- 2024$6,941 · 24 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Argenx US, Inc. | $1,705 | 9 |
| Ucb Sa | $1,693 | 9 |
| Abbvie Inc. | $276.16 | 2 |
| Merck Sharp & Dohme LLC | $113.45 | 3 |
| Janssen Biotech, Inc. | $100.14 | 1 |
What the 2025 payments were for
- Travel and Lodging$2,646 · 7 payments
- Food and Beverage$1,415 · 26 payments
- Education$141.39 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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