Quick answers
- Which hospitals does John Mason work at?
- Medicare's official clinician data lists John Mason at 5 hospitals: Camden Clark Medical Center, Jackson General Hospital, Marietta Memorial Hospital, Selby General Hospital and Sistersville General Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John Mason see patients?
- Medicare's clinician data lists 3 practice locations, including Marietta, OH, Williamstown, WV and Belpre, OH. Call before your visit to confirm the address.
- What is John Mason's specialty?
- Medicare lists Cardiovascular Disease (Cardiology) as the primary specialty.
- Does John Mason accept Medicare assignment?
- Yes. Medicare's clinician data says John Mason 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 Mason?
- (740) 568-5207, as listed in official Medicare / NPI Registry data.
- What is John Mason's NPI number?
- 1447464789. 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 Mason works
Medicare's Facility Affiliation Data lists John Mason at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Camden Clark Medical CenterParkersburg, WV · Acute Care Hospital · CCN 510058
- Jackson General HospitalRipley, WV · Critical Access Hospital · CCN 511320
- Marietta Memorial HospitalMarietta, OH · Acute Care Hospital · CCN 360147
- Selby General HospitalMarietta, OH · Critical Access Hospital · CCN 361319
- Sistersville General HospitalSistersville, WV · Critical Access Hospital · CCN 511304
Practice locations
Addresses where John Mason is enrolled with Medicare (CMS data updated 2026-10-02).
- 400 Matthew St, Suite 302Marietta, OH 45750 (740) 568‑5207
- 424 Highland AveWilliamstown, WV 26187 (740) 568‑4190
- 803 Farson St, Suite 400Belpre, OH 45714 (740) 568‑5207
Group practices
Medicare enrollment lists John Mason as a member of this group (CMS data updated 2026-10-02).
- Marietta Memorial Hospital392 clinicians in the group
Specialties
Find other Cardiovascular Disease (Cardiology) doctors in Ohio →
Other cardiologists in Marietta
Clinicians with the same Medicare primary specialty in Marietta, OH — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2002 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1447464789 |
| 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