Dennis J. Buchanan, MD
NPI 1003864737ActiveIndividual· Obstetrics & Gynecology· Fullerton, CA
Obstetrics & Gynecology (MD) in Fullerton, California, trained at University of Southern California Keck School of Medicine (class of 1979). Their prescriptions cost Medicare Part D more than their services did: $24,660 for 304 claims, against $9,844 paid for services in 2024. Bayer Healthcare Pharmaceuticals Inc. was the largest of 2 companies reporting payments in 2025, $55.29 in all, mostly food and beverage.
Overview
| NPI | 1003864737 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 5, 2006 |
| Last updated in NPPES | Oct 15, 2021 |
| Certified by provider | Oct 15, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Obstetrics & Gynecology Primary | 207V00000X | G42457 | 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 | 96 |
|---|---|
| Services billed | 128 across 16 procedure codes |
| Paid by Medicare | $9,844 |
Part D prescriptions in 2024
| Prescriptions (claims) | 304 · 634 30-day fills |
|---|---|
| Patients | 94 |
| Total drug cost | $24,660 |
| Generic share | 83% of claims |
Education and affiliations
| Medical school | University of Southern California Keck School of Medicine |
|---|---|
| Graduation year | 1979 |
| Medicare specialty | Obstetrics/Gynecology |
Medical group
- Providence Medical FoundationVictorville, CA · 1,466 clinicians
Hospital affiliation
- Providence St. Jude Medical CenterFullerton, CA
Industry payments (Open Payments)
- 2025$55.29 · 2 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Bayer Healthcare Pharmaceuticals Inc. | $28.79 | 1 |
| Hologic Sales and Service, LLC | $26.50 | 1 |
What the 2025 payments were for
- Food and Beverage$55.29 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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