Quick answers
- Which hospitals does John W. Mah work at?
- Medicare's official clinician data lists John W. Mah at 1 hospital: Hartford Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John W. Mah see patients?
- Medicare's clinician data lists 1 practice location in Hartford, CT. Call before your visit to confirm the address.
- What is John W. Mah's specialty?
- Medicare lists General Surgery as the primary specialty, and also Critical Care (Intensivists).
- Does John W. Mah accept Medicare assignment?
- Yes. Medicare's clinician data says John W. Mah 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 W. Mah?
- (860) 972-2249, as listed in official Medicare / NPI Registry data.
- What is John W. Mah's NPI number?
- 1316040272. 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 W. Mah works
Medicare's Facility Affiliation Data lists John W. Mah at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Hartford HospitalHartford, CT · Acute Care Hospital · CCN 070025
Practice locations
Addresses where John W. Mah is enrolled with Medicare (CMS data updated 2026-10-02).
- 80 Seymour StHartford, CT 06102 (860) 972‑2249
Group practices
Medicare enrollment lists John W. Mah as a member of this group (CMS data updated 2026-10-02).
- Hartford Hospital1,044 clinicians in the group
Specialties
- General Surgeryprimary
- Critical Care (Intensivists)also
Other general surgeons in Hartford
Clinicians with the same Medicare primary specialty in Hartford, CT — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Sanford School Of Medicine Of University Of South Dakota |
| Graduation year | 1998 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1316040272 |
| 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