David Kenneth Trefflich, MD
NPI 1861836942ActiveIndividual· Internal Medicine· Santa Maria, CA
Internal Medicine (MD) in Santa Maria, California, trained at University of California, Irvine, California College of Medicine (class of 2013). Their prescriptions cost Medicare Part D more than their services did: $423,692 for 3,628 claims, against $1,976 paid for services in 2024. Glaxosmithkline, LLC. was the largest of 5 companies reporting payments in 2025, $185.07 in all, mostly food and beverage.
Overview
| NPI | 1861836942 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 19, 2013 |
| Last updated in NPPES | Oct 28, 2020 |
| Certified by provider | Oct 23, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | A170337 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 128 |
|---|---|
| Services billed | 240 across 25 procedure codes |
| Paid by Medicare | $1,976 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,628 · 8,381 30-day fills |
|---|---|
| Patients | 282 |
| Total drug cost | $423,692 |
| Generic share | 82% of claims |
Education and affiliations
| Medical school | University of California, Irvine, California College of Medicine |
|---|---|
| Graduation year | 2013 |
| Medicare specialty | Internal Medicine |
Medical group
- Community Health Centers of the Central Coast IncNipomo, CA · 73 clinicians
Hospital affiliation
- Marian Regional Medical CenterSanta Maria, CA
Other facilities
- Central Coast Home Health IncHome health agency · San Luis Obispo, CA
- Dignity Health Home HealthHome health agency · Santa Maria, CA
Industry payments (Open Payments)
- 2025$185.07 · 9 payments from 5 companies
- 2024$76.73 · 4 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $77.39 | 4 |
| Novo Nordisk Inc | $48.43 | 2 |
| Kyowa Kirin, Inc. | $21.43 | 1 |
| Exact Sciences Corporation | $20.60 | 1 |
| Hologic Sales and Service, LLC | $17.22 | 1 |
What the 2025 payments were for
- Food and Beverage$185.07 · 9 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 37 internal medicine physicians in Santa Maria · All internal medicine physicians in California