Siamak Heydarian, M.D.
NPI 1225072077ActiveIndividual· Internal Medicine· Woodbridge, VA
Internal Medicine (M.D.) in Woodbridge, Virginia, licensed in VA, with an NPI issued in June 2006. Their prescriptions cost Medicare Part D more than their services did: $707,297 for 5,986 claims, against $106,254 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 10 companies reporting payments in 2025, $926.10 in all, mostly food and beverage. Lists Inova Mount Vernon Hospital and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1225072077 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jun 15, 2006 |
| Last updated in NPPES | Jan 16, 2008 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | 0101048248 | 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 - Internal Medicine (VA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 257 |
|---|---|
| Services billed | 1,747 across 23 procedure codes |
| Paid by Medicare | $106,254 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,986 · 14,893 30-day fills |
|---|---|
| Patients | 355 |
| Total drug cost | $707,297 |
| Generic share | 86% of claims |
Education and affiliations
| Graduation year | 1987 |
|---|---|
| Medicare specialty | Internal Medicine |
Hospital affiliations
- Inova Mount Vernon HospitalAlexandria, VA
- Mary Washington HospitalFredericksburg, VA
- Sentara Northern Virginia Medical CenterWoodbridge, VA
Other facilities
- Alternate Solutions Home Health-FairfaxHome health agency · Fairfax, VA
- Domain Medical Home Health & Staffing, IncHome health agency · Alexandria, VA
- Sentara Home Care ServicesHome health agency · Dumfries, VA
Industry payments (Open Payments)
- 2025$926.10 · 31 payments from 10 companies
- 2024$1,260 · 56 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $436.23 | 10 |
| Amgen Inc. | $155.47 | 7 |
| Novo Nordisk Inc | $109.14 | 4 |
| Bayer Healthcare Pharmaceuticals Inc. | $87.40 | 4 |
| Alk-Abello, Inc | $29.57 | 1 |
What the 2025 payments were for
- Food and Beverage$926.10 · 31 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other internal medicine physicians in Woodbridge
- 1023008976
- 1053807727
- 1073659900
- 1164446167
- 1194995605
- 1205342896
- 1205908324
- 1205926854
- 1215621446
- 1255688701
- 1265521611
- 1295848497
All 89 internal medicine physicians in Woodbridge · All internal medicine physicians in Virginia