Quick answers
- Which hospitals does Ralph T. Marcus work at?
- Medicare's official clinician data lists Ralph T. Marcus at 2 hospitals: Providence St. Jude Medical Center and UCI Health-Orange. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ralph T. Marcus see patients?
- Medicare's clinician data lists 2 practice locations, including Fullerton, CA. Call before your visit to confirm the address.
- What is Ralph T. Marcus's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Ralph T. Marcus accept Medicare assignment?
- Yes. Medicare's clinician data says Ralph T. Marcus 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 Ralph T. Marcus's NPI number?
- 1346566056. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ralph T. Marcus works
Medicare's Facility Affiliation Data lists Ralph T. Marcus at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Providence St. Jude Medical CenterFullerton, CA · Acute Care Hospital · CCN 050168
- UCI Health-OrangeOrange, CA · Acute Care Hospital · CCN 050348
Practice locations
Addresses where Ralph T. Marcus is enrolled with Medicare (CMS data updated 2026-10-02).
- 101 E Valencia Mesa DrFullerton, CA 92835
- 2141 N Harbor Blvd, Suite 16000Fullerton, CA 92835
Group practices
Medicare enrollment lists Ralph T. Marcus as a member of this group (CMS data updated 2026-10-02).
- St Jude Radiology Medical Group Inc61 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Fullerton
Clinicians with the same Medicare primary specialty in Fullerton, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, San Francisco School Of Medicine |
| Graduation year | 2009 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1346566056 |
| 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