Michael A. Rosenzweig, M.D.
NPI 1164470126ActiveIndividual· Internal Medicine, Hematology· Duarte, CA
Internal Medicine, Hematology (M.D.) in Duarte, California, trained at University of Arizona College of Medicine (class of 2001). Their prescriptions cost Medicare Part D more than their services did: $7,107,223 for 728 claims, against $76,771 paid for services in 2024. Janssen Research & Development, LLC was the largest of 4 companies reporting payments in 2025, $1,806 in all, mostly food and beverage.
Overview
| NPI | 1164470126 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 4, 2006 |
| Last updated in NPPES | Aug 26, 2026 |
| Certified by provider | Aug 26, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology Primary | 207RH0000X | A118217 | CA |
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 (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 223 |
|---|---|
| Services billed | 996 across 24 procedure codes |
| Paid by Medicare | $76,771 |
Part D prescriptions in 2024
| Prescriptions (claims) | 728 · 811 30-day fills |
|---|---|
| Patients | 98 |
| Total drug cost | $7,107,223 |
Education and affiliations
| Medical school | University of Arizona College of Medicine |
|---|---|
| Graduation year | 2001 |
| Medicare specialty | Hematology/Oncology |
| Telehealth | Offers telehealth |
Medical group
- City of Hope Medical FoundationDuarte, CA · 982 clinicians
Hospital affiliation
- Eisenhower Medical CenterRancho Mirage, CA
Industry payments (Open Payments)
- 2025$1,806 · 15 payments from 4 companies
- 2024$344.36 · 5 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Janssen Research & Development, LLC | $870.00 | 1 |
| Janssen Biotech, Inc. | $629.60 | 12 |
| Celgene Corporation | $156.25 | 1 |
| Alnylam Pharmaceuticals Inc. | $150.00 | 1 |
What the 2025 payments were for
- Food and Beverage$935.85 · 14 payments
- Consulting Fee$870.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 61 Internal Medicine, Hematology providers in Duarte · All Internal Medicine, Hematology providers in California