Cesar M. Castro, M.D., M.SC.
NPI 1184824112ActiveIndividual· Internal Medicine, Medical Oncology· Boston, MA
Internal Medicine, Medical Oncology (M.D., M.SC.) in Boston, Massachusetts, trained at University of California, San Francisco School of Medicine (class of 2005). Their prescriptions cost Medicare Part D more than their services did: $79,635 for 37 claims, against $25,140 paid for services in 2024. Qiagen, LLC was the largest of 3 companies reporting payments in 2025, $24,043 in all, mostly consulting fees.
Overview
| NPI | 1184824112 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D., M.SC. |
| Sole proprietor | Yes |
| NPI issued | Jul 18, 2007 |
| Last updated in NPPES | Feb 9, 2026 |
| Certified by provider | Feb 9, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Medical Oncology Primary | 207RX0202X | 235484 | MA |
| Internal Medicine | 207R00000X | 235484 | MA |
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 - Hematology/Oncology (MA); Practitioner - Hematology/Oncology (NH) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 77 |
|---|---|
| Services billed | 269 across 9 procedure codes |
| Paid by Medicare | $25,140 |
Part D prescriptions in 2024
| Prescriptions (claims) | 37 · 39 30-day fills |
|---|---|
| Patients | 20 |
| Total drug cost | $79,635 |
| Generic share | 86% of claims |
Education and affiliations
| Medical school | University of California, San Francisco School of Medicine |
|---|---|
| Graduation year | 2005 |
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Massachusetts General Physicians Organization IncBoston, MA · 3,558 clinicians
- Brigham and Womens Physicians Organization IncBoston, MA · 2,994 clinicians
- The General Hospital CorporationBoston, MA · 1,267 clinicians
Hospital affiliations
- Brigham and Women's HospitalBoston, MA
- Massachusetts General HospitalBoston, MA
Industry payments (Open Payments)
- 2025$24,043 · 26 payments from 3 companies
- 2024$18,000 · 12 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Qiagen, LLC | $18,000 | 12 |
| Canon Medical Informatics, Inc. | $6,000 | 13 |
| Astrazeneca Pharmaceuticals LP | $43.25 | 1 |
What the 2025 payments were for
- Consulting Fee$18,000 · 12 payments
- Honoraria$6,000 · 13 payments
- Education$43.25 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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