Quick answers
- Which hospitals does Marc J. Bernstein work at?
- Medicare's official clinician data lists Marc J. Bernstein at 4 hospitals: Mercy Hospital Lincoln, Mercy Hospital South, Mercy Hospital St Louis and Mercy Hospital Washington. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Marc J. Bernstein see patients?
- Medicare's clinician data lists 2 practice locations, including Troy, MO and St Louis, MO. Call before your visit to confirm the address.
- What is Marc J. Bernstein's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Marc J. Bernstein accept Medicare assignment?
- Yes. Medicare's clinician data says Marc J. Bernstein 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 J. Bernstein?
- (636) 561-9020, as listed in official Medicare / NPI Registry data.
- What is Marc J. Bernstein's NPI number?
- 1336110543. 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 J. Bernstein works
Medicare's Facility Affiliation Data lists Marc J. Bernstein at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Mercy Hospital LincolnTroy, MO · Critical Access Hospital · CCN 261319
- Mercy Hospital SouthSaint Louis, MO · Acute Care Hospital · CCN 260077
- Mercy Hospital St LouisSaint Louis, MO · Acute Care Hospital · CCN 260020
- Mercy Hospital WashingtonWashington, MO · Acute Care Hospital · CCN 260052
Practice locations
Addresses where Marc J. Bernstein is enrolled with Medicare (CMS data updated 2026-10-02).
- 1000 E Cherry StTroy, MO 63379 (636) 561‑9020
- 615 S New Ballas Rd, Mercy Jfk ClinicSt Louis, MO 63141 (314) 251‑6382
Group practices
Medicare enrollment lists Marc J. Bernstein as a member of these groups (CMS data updated 2026-10-02).
- Mercy Hospitals East Communities98 clinicians in the group
- Mercy Clinic Gastroenterology LLC67 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Missouri
Clinicians with the same Medicare primary specialty in Missouri — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Washington University School Of Medicine |
| Graduation year | 1992 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1336110543 |
| 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