Justiniano Castro - Montalvo, MD
NPI 1811041114ActiveIndividual· Internal Medicine, Hematology & Oncology· Arecibo, PR
Internal Medicine, Hematology & Oncology (MD) in Arecibo, Puerto Rico, trained at University of Puerto Rico School of Medicine (class of 1987). Their prescriptions cost Medicare Part D more than their services did: $4,956,624 for 1,782 claims, against $15,042 paid for services in 2024. Genentech USA, Inc. was the largest of 2 companies reporting payments in 2025, $69.02 in all, mostly food and beverage.
Overview
| NPI | 1811041114 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jan 23, 2007 |
| Last updated in NPPES | Feb 17, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | 10600 | 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 - Hematology/Oncology (PR) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 17 |
|---|---|
| Services billed | 2,321 across 23 procedure codes |
| Paid by Medicare | $15,042 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,782 · 1,922 30-day fills |
|---|---|
| Patients | 234 |
| Total drug cost | $4,956,624 |
| Generic share | 75% of claims |
Education and affiliations
| Medical school | University of Puerto Rico School of Medicine |
|---|---|
| Graduation year | 1987 |
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine |
Medical group
- Instituto del Cancer y Enfermedades de la Sangre, CspArecibo, PR · 3 clinicians
Hospital affiliations
- Hospital Centro Comprensivo del CancerSan Juan, PR
- Hospital Metropolitano Dr SusoniArecibo, PR
Industry payments (Open Payments)
- 2025$69.02 · 3 payments from 2 companies
- 2024$19.95 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genentech USA, Inc. | $40.25 | 2 |
| Tempus Ai, Inc | $28.77 | 1 |
What the 2025 payments were for
- Food and Beverage$69.02 · 3 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Internal Medicine, Hematology & Oncology providers in Arecibo
- 1992917314
- 1891990123
- 1073613352
- 1700926755
All Internal Medicine, Hematology & Oncology providers in Puerto Rico →