Marc Oliver Siegel, MD
NPI 1306866140ActiveIndividual· Internal Medicine, Infectious Disease· Washington, DC
Internal Medicine, Infectious Disease (MD) in Washington, District of Columbia, trained at Georgetown University School of Medicine (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $2,663,884 for 1,057 claims, against $64,382 paid for services in 2024. Gilead Sciences, Inc. was the largest of 2 companies reporting payments in 2025, $2,080 in all, mostly consulting fees.
Overview
| NPI | 1306866140 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jul 21, 2006 |
| Last updated in NPPES | May 22, 2009 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Infectious Disease Primary | 207RI0200X | MD32009 | DC |
| Internal Medicine | 207R00000X | MD32009 | DC |
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 - Infectious Disease (DC) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 239 |
|---|---|
| Services billed | 1,544 across 33 procedure codes |
| Paid by Medicare | $64,382 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,057 · 1,390 30-day fills |
|---|---|
| Patients | 115 |
| Total drug cost | $2,663,884 |
| Generic share | 38% of claims |
Education and affiliations
| Medical school | Georgetown University School of Medicine |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Infectious Disease |
Medical groups
- Medical Faculty Associates, IncWashington, DC · 672 clinicians
- Whitman-Walker Clinic, Inc.Washington, DC · 62 clinicians
Hospital affiliation
- George Washington Univ HospitalWashington, DC
Industry payments (Open Payments)
- 2025$2,080 · 15 payments from 2 companies
- 2024$2,830 · 17 payments from 4 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Gilead Sciences, Inc. | $1,935 | 2 |
| Shionogi Inc | $145.35 | 13 |
What the 2025 payments were for
- Consulting Fee$1,750 · 1 payment
- Food and Beverage$185.12 · 1 payment
- Education$145.35 · 13 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 123 infectious disease specialists in Washington · All infectious disease specialists in District of Columbia