Quick answers
- Which hospitals does John M. Barnwell work at?
- Medicare's official clinician data lists John M. Barnwell at 4 hospitals: Ascension Providence Hospital, Southfield and Novi…, Harper University Hospital, Huron Valley-Sinai Hospital and Sinai-Grace Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John M. Barnwell see patients?
- Medicare's clinician data lists 2 practice locations, including Detroit, MI. Call before your visit to confirm the address.
- What is John M. Barnwell's specialty?
- Medicare lists General Surgery as the primary specialty.
- Does John M. Barnwell accept Medicare assignment?
- Yes. Medicare's clinician data says John M. Barnwell 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 John M. Barnwell?
- (313) 864-8456, as listed in official Medicare / NPI Registry data.
- What is John M. Barnwell's NPI number?
- 1831105550. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John M. Barnwell works
Medicare's Facility Affiliation Data lists John M. Barnwell at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Ascension Providence Hospital, Southfield and Novi…Southfield, MI · Acute Care Hospital · CCN 230019
- Harper University HospitalDetroit, MI · Acute Care Hospital · CCN 230104
- Huron Valley-Sinai HospitalCommerce Township, MI · Acute Care Hospital · CCN 230277
- Sinai-Grace HospitalDetroit, MI · Acute Care Hospital · CCN 230024
Practice locations
Addresses where John M. Barnwell is enrolled with Medicare (CMS data updated 2026-10-02).
- 20400 Livernois AveDetroit, MI 48221 (313) 864‑8456
- 6071 W Outer DrDetroit, MI 48235 (313) 966‑3300
Group practices
Medicare enrollment lists John M. Barnwell as a member of this group (CMS data updated 2026-10-02).
- United Trauma Care PLC7 clinicians in the group
Specialties
- General Surgeryprimary
Other general surgeons in Detroit
Clinicians with the same Medicare primary specialty in Detroit, MI — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Howard University College Of Medicine |
| Graduation year | 1989 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1831105550 |
| 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