Oliver Guerrero Dujarric, MD
NPI 1861598039ActiveIndividual· Internal Medicine, Nephrology· Mayaguez, PR
Internal Medicine, Nephrology (MD) in Mayaguez, Puerto Rico, trained at Ponce School of Medicine (class of 1997). Their prescriptions cost Medicare Part D more than their services did: $310,123 for 1,325 claims, against $8,805 paid for services in 2024. Nxstage Medical, Inc. was the largest of 8 companies reporting payments in 2025, $541.39 in all, mostly food and beverage.
Overview
| NPI | 1861598039 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Sep 15, 2006 |
| Last updated in NPPES | Aug 16, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 13561 | 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 - Nephrology (PR) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 30 |
|---|---|
| Services billed | 183 across 11 procedure codes |
| Paid by Medicare | $8,805 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,325 · 1,410 30-day fills |
|---|---|
| Patients | 260 |
| Total drug cost | $310,123 |
| Generic share | 82% of claims |
Education and affiliations
| Medical school | Ponce School of Medicine |
|---|---|
| Graduation year | 1997 |
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
Medical group
- Nefrologos Asociados del OesteSan German, PR · 7 clinicians
Hospital affiliation
- Hospital de la ConcepcionSan German, PR
Other facilities
- Fmc Mayaguez NorteDialysis facility · Mayaguez, PR
Industry payments (Open Payments)
- 2025$541.39 · 12 payments from 8 companies
- 2024$504.48 · 10 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Nxstage Medical, Inc. | $198.04 | 2 |
| Calliditas Therapeutics US Inc. | $119.73 | 2 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $66.07 | 1 |
| Astrazeneca Pharmaceuticals LP | $38.03 | 2 |
| Amgen Inc. | $35.20 | 2 |
What the 2025 payments were for
- Food and Beverage$541.39 · 12 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Nephrology providers in Mayaguez
- 1700165685
- 1306965470
- 1194149732
- 1962978262
- 1649225806
- 1861596496
- 1205204823
- 1659724615
- 1043514110
- 1083710164
- 1467938795
- 1912022310
All Internal Medicine, Nephrology providers in Puerto Rico →