Michael J. Grupka, MD
NPI 1497953467ActiveIndividual· Internal Medicine, Gastroenterology· Hiram, GA
Internal Medicine, Gastroenterology (MD) with Gastrointestinal Specialist of Georgia, practicing in Hiram, Georgia. Their prescriptions cost Medicare Part D more than their services did: $432,117 for 964 claims, against $65,476 paid for services in 2024. Abbvie Inc. was the largest of 8 companies reporting payments in 2025, $568.54 in all, mostly food and beverage. Lists Wellstar Cobb Medical Center and 2 other hospitals as hospital affiliations.
Overview
| NPI | 1497953467 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Jul 10, 2007 |
| Last updated in NPPES | May 31, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | 060588 | GA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 329 |
|---|---|
| Services billed | 714 across 50 procedure codes |
| Paid by Medicare | $65,476 |
Part D prescriptions in 2024
| Prescriptions (claims) | 964 · 2,051 30-day fills |
|---|---|
| Patients | 260 |
| Total drug cost | $432,117 |
| Generic share | 90% of claims |
Education and affiliations
| Graduation year | 2002 |
|---|---|
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
Medical group
- Gastrointestinal Specialist of GeorgiaWoodstock, GA · 35 clinicians
Hospital affiliations
- Wellstar Cobb Medical CenterAustell, GA
- Wellstar Douglas Medical CenterDouglasville, GA
- Wellstar Paulding Medical CenterHiram, GA
Industry payments (Open Payments)
- 2025$568.54 · 25 payments from 8 companies
- 2024$185.65 · 9 payments from 7 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $173.41 | 11 |
| Madrigal Pharmaceuticals | $120.33 | 4 |
| Medtronic, Inc. | $94.80 | 1 |
| Ardelyx, Inc. | $53.21 | 2 |
| Janssen Biotech, Inc. | $48.46 | 3 |
What the 2025 payments were for
- Food and Beverage$568.54 · 25 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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