Margaret Williamson, M.D.
NPI 1093855884ActiveIndividual· Internal Medicine, Infectious Disease· Atlanta, GA
Internal Medicine, Infectious Disease (M.D.) in Atlanta, Georgia, trained at Emory University School of Medicine (class of 1993). Their prescriptions cost Medicare Part D more than their services did: $755,247 for 975 claims, against $123,298 paid for services in 2024. Viiv Healthcare Company was the largest of 2 companies reporting payments in 2025, $209.04 in all, mostly food and beverage.
Overview
| NPI | 1093855884 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 8, 2007 |
| Last updated in NPPES | Jan 17, 2024 |
| Certified by provider | Jan 17, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Infectious Disease Primary | 207RI0200X | 042143 | GA |
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 (GA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 312 |
|---|---|
| Services billed | 1,529 across 23 procedure codes |
| Paid by Medicare | $123,298 |
Part D prescriptions in 2024
| Prescriptions (claims) | 975 · 1,149 30-day fills |
|---|---|
| Patients | 210 |
| Total drug cost | $755,247 |
| Generic share | 77% of claims |
Education and affiliations
| Medical school | Emory University School of Medicine |
|---|---|
| Graduation year | 1993 |
| Medicare specialty | Infectious Disease |
| Secondary specialties | Internal Medicine |
Medical group
- Georgia Infectious Diseases, P.C.Atlanta, GA · 2 clinicians
Hospital affiliations
- Emory University Hospital MidtownAtlanta, GA
- Northside HospitalAtlanta, GA
- Northside Hospital ForsythCumming, GA
- Saint Joseph's Hospital of Atlanta, IncAtlanta, GA
Other facilities
- Accentcare Home Health of GeorgiaHome health agency · Roswell, GA
- Central Hh Care, An Amedisys CompanyHome health agency · Atlanta, GA
Industry payments (Open Payments)
- 2025$209.04 · 6 payments from 2 companies
- 2024$22.23 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Viiv Healthcare Company | $186.19 | 5 |
| Gilead Sciences, Inc. | $22.85 | 1 |
What the 2025 payments were for
- Food and Beverage$209.04 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other infectious disease specialists in Atlanta
- 1043449622
- 1104845353
- 1144300369
- 1144635160
- 1154986651
- 1174637532
- 1194266312
- 1194956151
- 1205976081
- 1275588139
- 1316127020
- 1366648164
All 209 infectious disease specialists in Atlanta · All infectious disease specialists in Georgia