John Charles Gustafson, M.D.
NPI 1003836016ActiveIndividual· Obstetrics & Gynecology· Ventura, CA
Obstetrics & Gynecology (M.D.) in Ventura, California, trained at University of Rochester School of Medicine and Dentistry (class of 1977). Their prescriptions cost Medicare Part D more than their services did: $41,561 for 516 claims, against $15,457 paid for services in 2024. Lilly USA, LLC was the largest of 6 companies reporting payments in 2025, $123.18 in all, mostly food and beverage.
Overview
| NPI | 1003836016 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 20, 2006 |
| Last updated in NPPES | Jul 9, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Obstetrics & Gynecology Primary | 207V00000X | G36782 | 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 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Obstetrics/Gynecology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 172 |
|---|---|
| Services billed | 258 across 13 procedure codes |
| Paid by Medicare | $15,457 |
Part D prescriptions in 2024
| Prescriptions (claims) | 516 · 1,069 30-day fills |
|---|---|
| Patients | 150 |
| Total drug cost | $41,561 |
| Generic share | 88% of claims |
Education and affiliations
| Medical school | University of Rochester School of Medicine and Dentistry |
|---|---|
| Graduation year | 1977 |
| Medicare specialty | Obstetrics/Gynecology |
Medical group
- Community Memorial Health SystemOxnard, CA · 185 clinicians
Hospital affiliation
- Community Memorial Hospital - VenturaVentura, CA
Industry payments (Open Payments)
- 2025$123.18 · 7 payments from 6 companies
- 2024$53.82 · 3 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $47.17 | 2 |
| Soleno Therapeutics, Inc. | $22.49 | 1 |
| Dexcom, Inc. | $17.16 | 1 |
| Novo Nordisk Inc | $15.20 | 1 |
| Sage Therapeutics, LLC | $13.69 | 1 |
What the 2025 payments were for
- Food and Beverage$123.18 · 7 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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