Quick answers
- Which hospitals does Sean McMahon work at?
- Medicare's official clinician data lists Sean McMahon at 4 hospitals: Griffin Hospital, Hartford Hospital, Middlesex Hospital and William W Backus Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sean McMahon see patients?
- Medicare's clinician data lists 2 practice locations, including Farmington, CT and Hartford, CT. Call before your visit to confirm the address.
- What is Sean McMahon's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does Sean McMahon accept Medicare assignment?
- Yes. Medicare's clinician data says Sean McMahon 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 Sean McMahon?
- (860) 522-5712, as listed in official Medicare / NPI Registry data.
- What is Sean McMahon's NPI number?
- 1295050169. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sean McMahon works
Medicare's Facility Affiliation Data lists Sean McMahon at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Griffin HospitalDerby, CT · Acute Care Hospital · CCN 070031
- Hartford HospitalHartford, CT · Acute Care Hospital · CCN 070025
- Middlesex HospitalMiddletown, CT · Acute Care Hospital · CCN 070020
- William W Backus HospitalNorwich, CT · Acute Care Hospital · CCN 070024
Practice locations
Addresses where Sean McMahon is enrolled with Medicare (CMS data updated 2026-10-02).
- 11 S Rd, Suite 100Farmington, CT 06032 (860) 522‑5712
- 80 Seymour StHartford, CT 06102
Group practices
Medicare enrollment lists Sean McMahon as a member of these groups (CMS data updated 2026-10-02).
- Hartford Healthcare Medical Group Specialists PLLC1,588 clinicians in the group
- Hartford Hospital1,044 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Connecticut →
Other cardiologists in Farmington
Clinicians with the same Medicare primary specialty in Farmington, CT — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2010 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1295050169 |
| 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