Quick answers
- Does Amir J. Momtahen accept Medicare assignment?
- Yes. Medicare's clinician data says Amir J. Momtahen accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of October 2, 2026. Ask the office to confirm before your visit.
- How many Medicare patients does Amir J. Momtahen see?
- In 2024, CMS data shows 2,260 Original Medicare patients and 3,398 services for Amir J. Momtahen. This counts Original Medicare only and measures volume, not quality.
- What is Amir J. Momtahen's NPI number?
- 1568620268. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Medicare activity in 2024
Official CMS public-use data for Amir J. Momtahen, data year 2024 (released May 21, 2026). It covers Original Medicare (fee-for-service) patients only, not Medicare Advantage or other insurance. It shows volume, not quality or outcomes. CMS hides any count of 10 or fewer patients.
| Original Medicare patients | 2,260 |
|---|---|
| Services billed to Medicare | 3,398 |
| Different services or procedures | 84 |
| Participating Medicare provider | Yes |
| Average age of these patients | 75 |
Most frequent services
- X-ray of chest, 1 view (71045)966 services
- Ct scan of abdomen and pelvis without contrast (74176)183 services
- Complete ultrasound scan behind abdominal cavity (76770)160 services
- Ct scan of abdomen and pelvis with contrast (74177)118 services
- X-ray of abdomen, 1 view (74018)92 services
Chronic conditions among these patients
Share of this clinician’s Original Medicare patients with each condition, as published by CMS (it describes the patients, not the care given).
- High blood pressure75%
- High cholesterol75%
- Arthritis67%
- Diabetes60%
- Ischemic heart disease55%
- Heart failure50%
Hospitals where Amir J. Momtahen works
Medicare's Facility Affiliation Data lists Amir J. Momtahen at these hospitals (updated October 2, 2026). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians. Star rating and emergency services: Hospital General Information (CMS), data updated October 26, 2026.
- Glendale Memorial Hospital & Health CenterGlendale, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050058
- Northridge Hospital Medical CenterNorthridge, CA · Acute Care Hospital · Medicare rating: 4 of 5 stars · Emergency services: listed by Medicare · CCN 050116
- Providence Saint Joseph Medical CenterBurbank, CA · Acute Care Hospital · Medicare rating: 3 of 5 stars · Emergency services: listed by Medicare · CCN 050235
- Ridgecrest Regional HospitalRidgecrest, CA · Critical Access Hospital · Emergency services: listed by Medicare · CCN 051333
- St Mary Medical CenterLong Beach, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050191
Practice locations
Addresses where Amir J. Momtahen is enrolled with Medicare (CMS data updated October 2, 2026).
- 1200 B Gale Wilson BlvdFairfield, CA 94533 (818) 639‑2901
- 1500 Duarte RdDuarte, CA 91010 (626) 256‑4673
- 31 PlumeriaIrvine, CA 92620 (818) 639‑2901
- 44105 15th W St, Suite 100Lancaster, CA 93534 (818) 435‑1433
- 9 Macarthur Pl, N703Santa Ana, CA 92707 (818) 435‑1433
Group practices
Medicare enrollment lists Amir J. Momtahen as a member of these groups (CMS data updated October 2, 2026).
- City of Hope Medical Foundation982 clinicians in the group
- Golden State Imaging Associates Inc239 clinicians in the group
- Renaissance Imaging Medical Associates Inc124 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Fairfield
Clinicians with the same Medicare primary specialty in Fairfield, CA — not a recommendation.
Other clinicians in City of Hope Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2003 (23 years since medical school) |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1568620268 |
| 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 October 2, 2026, retrieved October 29, 2026
- Hospital General Information — CMS, data updated October 26, 2026, retrieved November 13, 2026
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- Medicare Physician & Other Practitioners - by Provider — CMS, data year 2024, released May 21, 2026; Medicare Physician & Other Practitioners - by Provider and Service
- 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