Quick answers
- Which hospitals does Jay K. Mattheis work at?
- Medicare's official clinician data lists Jay K. Mattheis at 2 hospitals: Loma Linda University Medical Center and Riverside University Health System-Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jay K. Mattheis see patients?
- Medicare's clinician data lists 10 practice locations, including Loma Linda, CA, San Bernardino, CA and Moreno Valley, CA. Call before your visit to confirm the address.
- What is Jay K. Mattheis's specialty?
- Medicare lists Ophthalmology as the primary specialty.
- Does Jay K. Mattheis accept Medicare assignment?
- Yes. Medicare's clinician data says Jay K. Mattheis 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 Jay K. Mattheis?
- (909) 382-7100, as listed in official Medicare / NPI Registry data.
- What is Jay K. Mattheis's NPI number?
- 1154311058. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jay K. Mattheis works
Medicare's Facility Affiliation Data lists Jay K. Mattheis at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Loma Linda University Medical CenterLoma Linda, CA · Acute Care Hospital · CCN 050327
- Riverside University Health System-Medical CenterMoreno Valley, CA · Acute Care Hospital · CCN 050292
Practice locations
Addresses where Jay K. Mattheis is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 10; the Medicare profile lists all.
- 11234 Anderson StLoma Linda, CA 92354
- 11370 Anderson StLoma Linda, CA 92354
- 1454 E 2nd StSan Bernardino, CA 92408 (909) 382‑7100
- 250 S G StSan Bernardino, CA 92410 (909) 382‑7100
- 26520 Cactus AveMoreno Valley, CA 92555
Group practices
Medicare enrollment lists Jay K. Mattheis as a member of these groups (CMS data updated 2026-10-02).
- Faculty Physicians and Surgeons of Llusm1,315 clinicians in the group
- Sac Health System227 clinicians in the group
Specialties
- Ophthalmologyprimary
Other ophthalmologists in Loma Linda
Clinicians with the same Medicare primary specialty in Loma Linda, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loma Linda University School Of Medicine |
| Graduation year | 1988 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1154311058 |
| 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