Catherine A. Biren, M.D.
NPI 1124021035ActiveIndividual· Dermatology· Modesto, CA
Dermatology (M.D.) in Modesto, California, trained at Northwestern University Womans Medical School (class of 1980). 229 Medicare patients in 2024, $61,665 paid; nearly all of their 270 Part D prescriptions were generic (98%). Abbvie Inc. was the largest of 3 companies reporting payments in 2025, $200.76 in all, mostly food and beverage.
Overview
| NPI | 1124021035 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | May 24, 2005 |
| Last updated in NPPES | Mar 24, 2023 |
| Certified by provider | Mar 24, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Dermatology Primary | 207N00000X | G48190 | CA |
| Specialist | 174400000X | GR0045780 | CA |
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 - Dermatology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 229 |
|---|---|
| Services billed | 1,163 across 53 procedure codes |
| Paid by Medicare | $61,665 |
Part D prescriptions in 2024
| Prescriptions (claims) | 270 · 300 30-day fills |
|---|---|
| Patients | 127 |
| Total drug cost | $12,811 |
| Generic share | 98% of claims |
Education and affiliations
| Medical school | Northwestern University Womans Medical School |
|---|---|
| Graduation year | 1980 |
| Medicare specialty | Dermatology |
Medical group
- Csi Medical GroupFullerton, CA · 111 clinicians
Hospital affiliation
- Community Hospital of the Monterey PeninsulaMonterey, CA
Industry payments (Open Payments)
- 2025$200.76 · 4 payments from 3 companies
- 2024$583.63 · 9 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $147.30 | 2 |
| Novartis Pharmaceuticals Corporation | $27.23 | 1 |
| Incyte Corporation | $26.23 | 1 |
What the 2025 payments were for
- Food and Beverage$200.76 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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