Quick answers
- Which hospitals does Ammar Istwani work at?
- Medicare's official clinician data lists Ammar Istwani at 2 hospitals: Dominican Hospital and Sierra Nevada Memorial Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ammar Istwani see patients?
- Medicare's clinician data lists 4 practice locations, including Roseville, CA, Folsom, CA and Sacramento, CA. Call before your visit to confirm the address.
- What is Ammar Istwani's specialty?
- Medicare lists Diagnostic Radiology as the primary specialty.
- Does Ammar Istwani accept Medicare assignment?
- Yes. Medicare's clinician data says Ammar Istwani 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 Ammar Istwani?
- (916) 535-2030, as listed in official Medicare / NPI Registry data.
- What is Ammar Istwani's NPI number?
- 1386683258. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ammar Istwani works
Medicare's Facility Affiliation Data lists Ammar Istwani at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Dominican HospitalSanta Cruz, CA · Acute Care Hospital · CCN 050242
- Sierra Nevada Memorial HospitalGrass Valley, CA · Acute Care Hospital · CCN 050150
Practice locations
Addresses where Ammar Istwani is enrolled with Medicare (CMS data updated 2026-10-02).
- 1380 Lead Hill Blvd, Suite 100Roseville, CA 95661 (916) 535‑2030
- 1700 Prairie City RdFolsom, CA 95630 (916) 351‑4800
- 1730 Prairie City Rd, Suite 120Folsom, CA 95630 (916) 351‑4800
- 3000 Q StSacramento, CA 95816 (916) 560‑0319
Group practices
Medicare enrollment lists Ammar Istwani as a member of this group (CMS data updated 2026-10-02).
- Dignity Health Medical Foundation1,184 clinicians in the group
Specialties
- Diagnostic Radiologyprimary
Other radiologists in Roseville
Clinicians with the same Medicare primary specialty in Roseville, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Ohio State University College Of Medicine |
| Graduation year | 1992 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1386683258 |
| 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