Margaret Chaffin Siman, M.D.
NPI 1225006729ActiveIndividual· Family Medicine· Staunton, VA
Family Medicine (M.D.) in Staunton, Virginia, trained at Eastern Virginia Medical School (class of 1994). Their prescriptions cost Medicare Part D more than their services did: $627,816 for 5,012 claims, against $21,721 paid for services in 2024. Lilly USA, LLC was the largest of 5 companies reporting payments in 2025, $429.90 in all, mostly food and beverage.
Overview
| NPI | 1225006729 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Mar 9, 2006 |
| Last updated in NPPES | Feb 23, 2023 |
| Certified by provider | Feb 23, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Family Medicine Primary | 207Q00000X | 0101053670 | VA |
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 - Family Practice (VA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 103 |
|---|---|
| Services billed | 266 across 9 procedure codes |
| Paid by Medicare | $21,721 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,012 · 9,438 30-day fills |
|---|---|
| Patients | 680 |
| Total drug cost | $627,816 |
| Generic share | 76% of claims |
Education and affiliations
| Medical school | Eastern Virginia Medical School |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Family Practice |
Hospital affiliations
- Augusta HealthFishersville, VA
- Sentara Martha Jefferson HospitalCharlottesville, VA
- Sentara Rmh Medical CenterHarrisonburg, VA
- University of Virginia Medical CenterCharlottesville, VA
Other facilities
- Amedisys Home Health CareHome health agency · Staunton, VA
- Augusta Home Care,Home health agency · Fishersville, VA
Industry payments (Open Payments)
- 2025$429.90 · 23 payments from 5 companies
- 2024$320.49 · 17 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $143.38 | 7 |
| Novo Nordisk Inc | $103.62 | 5 |
| Pfizer Inc. | $101.68 | 6 |
| Otsuka America Pharmaceutical, Inc. | $50.63 | 3 |
| Neuronetics, Inc. | $30.59 | 2 |
What the 2025 payments were for
- Food and Beverage$429.90 · 23 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 24 family medicine physicians in Staunton · All family medicine physicians in Virginia