Jeffrey K. Feinfield, M.D.
NPI 1740372028ActiveIndividual· Specialist· Thousand Oaks, CA
Specialist (M.D.) in Thousand Oaks, California, trained at University of Southern California Keck School of Medicine (class of 1998). 343 Medicare patients in 2024, $322,634 paid; nearly all of their 574 Part D prescriptions were generic (94%). Genzyme Corporation was the largest of 9 companies reporting payments in 2025, $1,386 in all, mostly food and beverage.
Overview
| NPI | 1740372028 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Sep 28, 2006 |
| Last updated in NPPES | Apr 27, 2017 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Specialist Primary | 174400000X | A71991 | 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 - Otolaryngology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 343 |
|---|---|
| Services billed | 1,691 across 37 procedure codes |
| Paid by Medicare | $322,634 |
Part D prescriptions in 2024
| Prescriptions (claims) | 574 · 760 30-day fills |
|---|---|
| Patients | 198 |
| Total drug cost | $70,108 |
| Generic share | 94% of claims |
Education and affiliations
| Medical school | University of Southern California Keck School of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Otolaryngology |
| Secondary specialties | Plastic And Reconstructive Surgery |
Medical group
- Jeffrey Feinfield, M.D. IncThousand Oaks, CA · 4 clinicians
Industry payments (Open Payments)
- 2025$1,386 · 39 payments from 9 companies
- 2024$9,411 · 48 payments from 6 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genzyme Corporation | $338.53 | 15 |
| Stryker Corporation | $329.08 | 3 |
| Glaxosmithkline, LLC. | $296.71 | 10 |
| Aerin Medical Inc. | $231.14 | 3 |
| Regeneron Healthcare Solutions, Inc. | $59.81 | 3 |
What the 2025 payments were for
- Food and Beverage$1,386 · 39 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 54 Specialist providers in Thousand Oaks · All Specialist providers in California