Quick answers
- Does Larissa Isterabadi accept Medicare assignment?
- Yes. Medicare's clinician data says Larissa Isterabadi 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.
- What is Larissa Isterabadi's NPI number?
- 1821125543. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Larissa Isterabadi is enrolled with Medicare (CMS data updated October 2, 2026).
- 1835 Sunny Crest DrFullerton, CA 92835 (714) 446‑5101
- 1837 Sunny Crest DrFullerton, CA 92835 (714) 446‑5831
- 1950 Sunny Crest Dr, Suite 2900Fullerton, CA 92835 (714) 992‑5350
Group practices
Medicare enrollment lists Larissa Isterabadi as a member of this group (CMS data updated October 2, 2026).
- Providence Medical Foundation1,466 clinicians in the group
Specialties
- Pediatric Medicineprimary
Other pediatricians in Fullerton
Clinicians with the same Medicare primary specialty in Fullerton, CA — not a recommendation.
Other clinicians in Providence Medical Foundation
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Southern California Keck School Of Medicine |
| Graduation year | 2001 (25 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1821125543 |
| 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
- National Downloadable File (Doctors and Clinicians) — CMS, data updated October 2, 2026, retrieved October 29, 2026
- 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