Quick answers
- Which hospitals does Michael J. Grupka work at?
- Medicare's official clinician data lists Michael J. Grupka at 3 hospitals: Wellstar Cobb Medical Center, Wellstar Douglas Medical Center and Wellstar Paulding Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Michael J. Grupka see patients?
- Medicare's clinician data lists 4 practice locations, including Hiram, GA, Douglasville, GA and Marietta, GA. Call before your visit to confirm the address.
- What is Michael J. Grupka's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Michael J. Grupka accept Medicare assignment?
- Yes. Medicare's clinician data says Michael J. Grupka accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Michael J. Grupka?
- (678) 741-5000, as listed in official Medicare / NPI Registry data.
- What is Michael J. Grupka's NPI number?
- 1497953467. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Michael J. Grupka works
Medicare's Facility Affiliation Data lists Michael J. Grupka at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Wellstar Cobb Medical CenterAustell, GA · Acute Care Hospital · CCN 110143
- Wellstar Douglas Medical CenterDouglasville, GA · Acute Care Hospital · CCN 110184
- Wellstar Paulding Medical CenterHiram, GA · Acute Care Hospital · CCN 110042
Practice locations
Addresses where Michael J. Grupka is enrolled with Medicare (CMS data updated 2026-10-02).
- 148 Bill Carruth Pkwy, Suite 200Hiram, GA 30141 (678) 741‑5000
- 6002 Professional Pkwy, Suite 200Douglasville, GA 30134 (678) 741‑5000
- 711 Canton Rd, Suite 300Marietta, GA 30060 (678) 741‑5000
- 711 Canton Rd NE, Suite 300Marietta, GA 30060 (678) 741‑5000
Group practices
Medicare enrollment lists Michael J. Grupka as a member of this group (CMS data updated 2026-10-02).
- Gastrointestinal Specialist of Georgia35 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Hiram
Clinicians with the same Medicare primary specialty in Hiram, GA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2002 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1497953467 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians