Quick answers
- Does Olivia S. Horan accept Medicare assignment?
- Medicare's clinician data says Olivia S. Horan may accept Medicare assignment (as of October 2, 2026). Ask the office whether they accept it for your visit.
- What is Olivia S. Horan's NPI number?
- 1306529896. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Olivia S. Horan works
Medicare's Facility Affiliation Data lists Olivia S. Horan 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.
- Marinhealth Medical CenterGreenbrae, CA · Acute Care Hospital · Medicare rating: 5 of 5 stars · Emergency services: listed by Medicare · CCN 050360
Practice locations
Addresses where Olivia S. Horan is enrolled with Medicare (CMS data updated October 2, 2026).
- 16 Ritter StSan Rafael, CA 94901 (415) 457‑8182
Group practices
Medicare enrollment lists Olivia S. Horan as a member of this group (CMS data updated October 2, 2026).
- Ritter Center3 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in San Rafael
Clinicians with the same Medicare primary specialty in San Rafael, CA — not a recommendation.
Other clinicians in Ritter Center
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| School | University Of California, San Francisco School Of Medicine |
| Graduation year | 2023 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1306529896 |
| 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
- 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