Roy B. Blumenstrauch, M.D.
NPI 1639175409ActiveIndividual· Specialist· Torrance, CA
Specialist (M.D.) in Torrance, California, trained at University of California, Geffen School of Medicine (class of 1983). 1,547 Medicare patients in 2024, $1,042,073 paid; nearly all of their 1,194 Part D prescriptions were generic (96%). Abbvie Inc. was the largest of 7 companies reporting payments in 2025, $316.52 in all, mostly food and beverage.
Overview
| NPI | 1639175409 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 24, 2005 |
| Last updated in NPPES | Nov 27, 2007 |
| Reactivated | Apr 5, 2006 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Specialist Primary | 174400000X | G54548 | 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 - Dermatology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,547 |
|---|---|
| Services billed | 19,560 across 82 procedure codes |
| Paid by Medicare | $1,042,073 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,194 · 1,461 30-day fills |
|---|---|
| Patients | 500 |
| Total drug cost | $355,842 |
| Generic share | 96% of claims |
Education and affiliations
| Medical school | University of California, Geffen School of Medicine |
|---|---|
| Graduation year | 1983 |
| Medicare specialty | Dermatology |
| Telehealth | Offers telehealth |
Medical group
- Csi Medical GroupFullerton, CA · 111 clinicians
Hospital affiliation
- Torrance Memorial Medical CenterTorrance, CA
Industry payments (Open Payments)
- 2025$316.52 · 11 payments from 7 companies
- 2024$214.79 · 9 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $89.89 | 4 |
| Novartis Pharmaceuticals Corporation | $65.77 | 2 |
| Janssen Biotech, Inc. | $54.99 | 1 |
| Galderma Laboratories, L.P. | $32.57 | 1 |
| Genzyme Corporation | $27.33 | 1 |
What the 2025 payments were for
- Food and Beverage$261.53 · 10 payments
- Education$54.99 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 107 Specialist providers in Torrance · All Specialist providers in California