Carl William Buckhorn, M.D.
NPI 1649264847ActiveIndividual· Internal Medicine· Yorba Linda, CA
Internal Medicine (M.D.) in Yorba Linda, California, licensed in CA, with an NPI issued in September 2005. Their prescriptions cost Medicare Part D more than their services did: $224,680 for 3,541 claims, against $18,054 paid for services in 2024. Amgen Inc. was the largest of 2 companies reporting payments in 2025, $256.52 in all, mostly food and beverage. Lists Providence St. Jude Medical Center as a hospital affiliation.
Overview
| NPI | 1649264847 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Sep 2, 2005 |
| Last updated in NPPES | Jul 14, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | G73630 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 75 |
|---|---|
| Services billed | 252 across 16 procedure codes |
| Paid by Medicare | $18,054 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,541 · 6,345 30-day fills |
|---|---|
| Patients | 297 |
| Total drug cost | $224,680 |
| Generic share | 90% of claims |
Education and affiliations
| Graduation year | 1990 |
|---|---|
| Medicare specialty | Internal Medicine |
| Secondary specialties | General Practice, Geriatric Medicine |
| Telehealth | Offers telehealth |
Hospital affiliation
- Providence St. Jude Medical CenterFullerton, CA
Other facilities
- Mve Home Health Care, LLCHome health agency · La Habra, CA
- Park Regency Care CenterNursing home · La Habra, CA
- Terrace View Care CenterNursing home · Fullerton, CA
- The Pavilion at Sunny HillsNursing home · Fullerton, CA
Industry payments (Open Payments)
- 2025$256.52 · 2 payments from 2 companies
- 2024$376.97 · 4 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $134.69 | 1 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $121.83 | 1 |
What the 2025 payments were for
- Food and Beverage$256.52 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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