Ahmed Aly Messallam, M.D
NPI 1629489547ActiveIndividual· Internal Medicine, Gastroenterology· Marietta, GA
Internal Medicine, Gastroenterology (M.D) with Wellstar Medical Group LLC, practicing in Marietta, Georgia. Their prescriptions cost Medicare Part D more than their services did: $112,347 for 624 claims, against $63,568 paid for services in 2024. Madrigal Pharmaceuticals was the largest of 9 companies reporting payments in 2025, $630.70 in all, mostly food and beverage. Lists Wellstar Cobb Medical Center and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1629489547 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D |
| Sole proprietor | No |
| NPI issued | May 13, 2014 |
| Last updated in NPPES | Dec 12, 2024 |
| Certified by provider | Dec 12, 2024 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 74933 | GA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | 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 - Gastroenterology (GA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 216 |
|---|---|
| Services billed | 635 across 45 procedure codes |
| Paid by Medicare | $63,568 |
Part D prescriptions in 2024
| Prescriptions (claims) | 624 · 849 30-day fills |
|---|---|
| Patients | 245 |
| Total drug cost | $112,347 |
| Generic share | 84% of claims |
Education and affiliations
| Graduation year | 2011 |
|---|---|
| Medicare specialty | Gastroenterology |
| Telehealth | Offers telehealth |
Medical group
- Wellstar Medical Group LLCMarietta, GA · 3,093 clinicians
Hospital affiliations
- Wellstar Cobb Medical CenterAustell, GA
- Wellstar Douglas Medical CenterDouglasville, GA
- Wellstar Kennestone Regional Medical CenterMarietta, GA
- Wellstar North Fulton Medical CenterRoswell, GA
- Wellstar Paulding Medical CenterHiram, GA
Other facilities
- Wellstar Windy Hill HospitalLong-term care hospital · Marietta, GA
Industry payments (Open Payments)
- 2025$630.70 · 18 payments from 9 companies
- 2024$1,413 · 16 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Madrigal Pharmaceuticals | $195.52 | 7 |
| Fujifilm Healthcare Americas Corporation | $138.36 | 1 |
| Regeneron Healthcare Solutions, Inc. | $128.51 | 2 |
| Takeda Pharmaceuticals U.S.A., Inc. | $59.51 | 3 |
| Genzyme Corporation | $24.00 | 1 |
What the 2025 payments were for
- Food and Beverage$630.70 · 18 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other gastroenterologists in Marietta
- 1023283751
- 1134336332
- 1154305191
- 1225383797
- 1235438607
- 1366462160
- 1538144613
- 1619952777
- 1720037021
- 1720263809
- 1821250267
- 1831118405
All 24 gastroenterologists in Marietta · All gastroenterologists in Georgia