William Vega-Ocasio, M.D.
NPI 1598750317ActiveIndividual· Internal Medicine, Nephrology· Cayey, PR
Internal Medicine, Nephrology (M.D.) in Cayey, Puerto Rico, licensed in PR, with an NPI issued in September 2005. Their prescriptions cost Medicare Part D more than their services did: $2,286,281 for 18,769 claims, against $18,898 paid for services in 2024. Boehringer Ingelheim Pharmaceuticals, Inc. was the largest of 4 companies reporting payments in 2025, $17,619 in all, mostly speaking and faculty fees. Lists Hospital Menonita de Cayey as a hospital affiliation.
Overview
| NPI | 1598750317 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Sep 19, 2005 |
| Last updated in NPPES | Jan 19, 2010 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | 14673 | 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 | 26 |
|---|---|
| Services billed | 116 across 9 procedure codes |
| Paid by Medicare | $18,898 |
Part D prescriptions in 2024
| Prescriptions (claims) | 18,769 · 24,226 30-day fills |
|---|---|
| Patients | 816 |
| Total drug cost | $2,286,281 |
| Generic share | 75% of claims |
Education and affiliations
| Graduation year | 1998 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
Hospital affiliation
- Hospital Menonita de CayeyCayey, PR
Other facilities
- Fmc AibonitoDialysis facility · Aibonito, PR
- Fmc CayeyDialysis facility · Cayey, PR
Industry payments (Open Payments)
- 2025$17,619 · 20 payments from 4 companies
- 2024$21,857 · 25 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Boehringer Ingelheim Pharmaceuticals, Inc. | $14,350 | 14 |
| Lilly USA, LLC | $3,224 | 4 |
| Bayer Puerto Rico Inc. | $23.95 | 1 |
| Vifor Pharma, Inc. | $21.33 | 1 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$16,810 · 9 payments
- Food and Beverage$669.06 · 10 payments
- Travel and Lodging$140.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Nephrology providers in Cayey
- 1972550259
- 1346549045
- 1972980498
All Internal Medicine, Nephrology providers in Puerto Rico →