Quick answers
- Does Arianna G. Cassidy accept Medicare assignment?
- Yes. Medicare's clinician data says Arianna G. Cassidy 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 Arianna G. Cassidy's NPI number?
- 1902268923. 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 Arianna G. Cassidy is enrolled with Medicare (CMS data updated October 2, 2026). The first 5 of 6; the Medicare profile lists all.
- 1411 E 31st StOakland, CA 94602 (510) 437‑4800
- 3100 San Pablo AveBerkeley, CA 94702 (510) 985‑5020
- 400 Parnassus AveSan Francisco, CA 94143
- 505 Parnassus AveSan Francisco, CA 94143 (415) 476‑1000
- 505 Parnassus Ave, M1490San Francisco, CA 94143 (415) 472‑1000
Group practices
Medicare enrollment lists Arianna G. Cassidy as a member of these groups (CMS data updated October 2, 2026).
- UCSF Medical Group Business Services1,598 clinicians in the group
- Alameda Health System601 clinicians in the group
Specialties
- Hospitalistprimary
- Obstetrics/Gynecologyalso
Other hospitalists in Oakland
Clinicians with the same Medicare primary specialty in Oakland, CA — not a recommendation.
Other clinicians in UCSF Medical Group Business Services
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of California, San Francisco School Of Medicine |
| Graduation year | 2016 (10 years since medical school) |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1902268923 |
| 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