Quick answers
- Which hospitals does Marc A. Greenstein work at?
- Medicare's official clinician data lists Marc A. Greenstein at 5 hospitals: Northside Hospital, Northside Hospital Gwinnett, Piedmont Eastside Medical Center, Piedmont Hospital, Inc and Piedmont Rockdale Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marc A. Greenstein see patients?
- Medicare's clinician data lists 3 practice locations, including Snellville, GA and Dunwoody, GA. Call before your visit to confirm the address.
- What is Marc A. Greenstein's specialty?
- Medicare lists Urology as the primary specialty.
- Does Marc A. Greenstein accept Medicare assignment?
- Yes. Medicare's clinician data says Marc A. Greenstein 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 Marc A. Greenstein?
- (678) 344-8900, as listed in official Medicare / NPI Registry data.
- What is Marc A. Greenstein's NPI number?
- 1154383743. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Marc A. Greenstein works
Medicare's Facility Affiliation Data lists Marc A. Greenstein at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Northside HospitalAtlanta, GA · Acute Care Hospital · CCN 110161
- Northside Hospital GwinnettLawrenceville, GA · Acute Care Hospital · CCN 110087
- Piedmont Eastside Medical CenterSnellville, GA · Acute Care Hospital · CCN 110192
- Piedmont Hospital, IncAtlanta, GA · Acute Care Hospital · CCN 110083
- Piedmont Rockdale HospitalConyers, GA · Acute Care Hospital · CCN 110091
Practice locations
Addresses where Marc A. Greenstein is enrolled with Medicare (CMS data updated 2026-10-02).
- 1561 Janmar RdSnellville, GA 30078 (678) 344‑8900
- 5513 Chamblee Dunwoody RdDunwoody, GA 30338 (770) 551‑9633
- 5513 Chamblee Dunwoody Rd, Suite 430Dunwoody, GA 30338 (770) 551‑9633
Group practices
Medicare enrollment lists Marc A. Greenstein as a member of these groups (CMS data updated 2026-10-02).
- Physiotherapy Associates Inc1,460 clinicians in the group
- Advanced Urology of Ga-East, PC17 clinicians in the group
Specialties
- Urologyprimary
Other urologists in Snellville
Clinicians with the same Medicare primary specialty in Snellville, GA — not a recommendation.
Clinician information
| Credential | DO |
|---|---|
| Medical school | Philadelphia College Of Osteopathic Medicine |
| Graduation year | 1997 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1154383743 |
| 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