Quick answers
- Which hospitals does Mark N. Masotto work at?
- Medicare's official clinician data lists Mark N. Masotto at 5 hospitals: Avita Ontario, Genesis Hospital, Marietta Memorial Hospital, Providence St. Joseph Hospital and Riverside Methodist Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mark N. Masotto see patients?
- Medicare's clinician data lists 9 practice locations, including Orange, CA, Tustin, CA and Garden Grove, CA. Call before your visit to confirm the address.
- What is Mark N. Masotto's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Mark N. Masotto accept Medicare assignment?
- Yes. Medicare's clinician data says Mark N. Masotto 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 Mark N. Masotto?
- (714) 997-4762, as listed in official Medicare / NPI Registry data.
- What is Mark N. Masotto's NPI number?
- 1033118336. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mark N. Masotto works
Medicare's Facility Affiliation Data lists Mark N. Masotto at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Avita OntarioOntario, OH · Acute Care Hospital · CCN 360365
- Genesis HospitalZanesville, OH · Acute Care Hospital · CCN 360039
- Marietta Memorial HospitalMarietta, OH · Acute Care Hospital · CCN 360147
- Providence St. Joseph HospitalOrange, CA · Acute Care Hospital · CCN 050069
- Riverside Methodist HospitalColumbus, OH · Acute Care Hospital · CCN 360006
Practice locations
Addresses where Mark N. Masotto is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 9; the Medicare profile lists all.
- 1031 W Chapman AveOrange, CA 92868 (714) 997‑4762
- 1095 Irvine BlvdTustin, CA 92780 (714) 505‑7110
- 1100 W Stewart Dr, St Joseph HospitalOrange, CA 92868 (714) 771‑8171
- 12942 Harbor BlvdGarden Grove, CA 92840 (714) 705‑2120
- 14 DreamlightIrvine, CA 92603 (614) 340‑7740
Group practices
Medicare enrollment lists Mark N. Masotto as a member of these groups (CMS data updated 2026-10-02).
- Riverside Radiology and Interventional Associates Inc253 clinicians in the group
- Moran Rowen and Dorsey Inc37 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Orange
Clinicians with the same Medicare primary specialty in Orange, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Creighton University School Of Medicine |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1033118336 |
| 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