Quick answers
- Which hospitals does John Duffy work at?
- Medicare's official clinician data lists John Duffy at 5 hospitals: Canton-Potsdam Hospital, Carthage Area Hospital, Inc, Carthage Area Hospital, Inc, Gouverneur Hospital and SLHS Massena, Inc. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John Duffy see patients?
- Medicare's clinician data lists 9 practice locations, including Ogdensburg, NY, Carthage, NY and Madrid, NY. Call before your visit to confirm the address.
- What is John Duffy's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does John Duffy accept Medicare assignment?
- Yes. Medicare's clinician data says John Duffy 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 Duffy?
- (315) 394-9462, as listed in official Medicare / NPI Registry data.
- What is John Duffy's NPI number?
- 1295710358. 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 Duffy works
Medicare's Facility Affiliation Data lists John Duffy at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Canton-Potsdam HospitalPotsdam, NY · Acute Care Hospital · CCN 330197
- Carthage Area Hospital, IncCarthage, NY · Critical Access Hospital · CCN 331318
- Carthage Area Hospital, IncOgdensburg, NY · Critical Access Hospital · CCN 331324
- Gouverneur HospitalGouverneur, NY · Critical Access Hospital · CCN 331315
- SLHS Massena, IncMassena, NY · Critical Access Hospital · CCN 331322
Practice locations
Addresses where John Duffy is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 9; the Medicare profile lists all.
- 100 Horwood PlOgdensburg, NY 13669 (315) 394‑9462
- 1001 W StCarthage, NY 13619 (315) 493‑1000
- 117 N Mechanic StCarthage, NY 13619 (315) 493‑4187
- 214 King StOgdensburg, NY 13669 (315) 393‑3600
- 214 King St, Suite AOgdensburg, NY 13669 (315) 393‑3600
Group practices
Medicare enrollment lists John Duffy as a member of these groups (CMS data updated 2026-10-02).
- Carthage Area Hospital Inc119 clinicians in the group
- Claxton-Hepburn Medical Center76 clinicians in the group
- United Cerebral Palsy Association of the North Country Inc32 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Ogdensburg
Clinicians with the same Medicare primary specialty in Ogdensburg, NY — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1295710358 |
| 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