Quick answers
- Which hospitals does Paymon Mesgarzadeh work at?
- Medicare's official clinician data lists Paymon Mesgarzadeh at 1 hospital: Kaiser Foundation Hospital Fontana/Ontario. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Paymon Mesgarzadeh see patients?
- Medicare's clinician data lists 4 practice locations, including Redlands, CA, Ontario, CA and Hesperia, CA. Call before your visit to confirm the address.
- What is Paymon Mesgarzadeh's specialty?
- Medicare lists Internal Medicine as the primary specialty, and also Cardiovascular Disease (Cardiology).
- Does Paymon Mesgarzadeh accept Medicare assignment?
- Yes. Medicare's clinician data says Paymon Mesgarzadeh 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 Paymon Mesgarzadeh?
- (909) 809-3222, as listed in official Medicare / NPI Registry data.
- What is Paymon Mesgarzadeh's NPI number?
- 1023216892. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Paymon Mesgarzadeh works
Medicare's Facility Affiliation Data lists Paymon Mesgarzadeh at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Kaiser Foundation Hospital Fontana/OntarioFontana, CA · Acute Care Hospital · CCN 050140
Practice locations
Addresses where Paymon Mesgarzadeh is enrolled with Medicare (CMS data updated 2026-10-02).
- 1301 California StRedlands, CA 92374 (909) 809‑3222
- 2295 S Vineyard AveOntario, CA 91761 (909) 724‑5000
- 9550 Escondido AveHesperia, CA 92345 (833) 574‑2273
- 9961 Sierra AveFontana, CA 92335 (909) 427‑5000
Group practices
Medicare enrollment lists Paymon Mesgarzadeh as a member of this group (CMS data updated 2026-10-02).
- Southern California Permanente Medical Group11,293 clinicians in the group
Specialties
Other internal medicine doctors in Redlands
Clinicians with the same Medicare primary specialty in Redlands, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Wayne State University School Of Medicine |
| Graduation year | 2004 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1023216892 |
| 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