Quick answers
- Does Ana M. Rothhammer Ruiz accept Medicare assignment?
- Yes. Medicare's clinician data says Ana M. Rothhammer Ruiz 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 Ana M. Rothhammer Ruiz's NPI number?
- 1427621820. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ana M. Rothhammer Ruiz works
Medicare's Facility Affiliation Data lists Ana M. Rothhammer Ruiz 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.
- Highland HospitalOakland, CA · Acute Care Hospital · Medicare rating: 1 of 5 stars · Emergency services: listed by Medicare · CCN 050320
Practice locations
Addresses where Ana M. Rothhammer Ruiz is enrolled with Medicare (CMS data updated October 2, 2026).
- 1411 E 31st StOakland, CA 94602 (510) 437‑4800
- 2238 Geary BlvdSan Francisco, CA 94115 (415) 833‑2200
- 6955 Foothill Blvd, Suite 200Oakland, CA 94605 (510) 567‑5704
Group practices
Medicare enrollment lists Ana M. Rothhammer Ruiz as a member of these groups (CMS data updated October 2, 2026).
- Permanente Medical Group Inc10,996 clinicians in the group
- Alameda Health System601 clinicians in the group
Specialties
- Nurse Practitionerprimary
Other nurse practitioners in Oakland
Clinicians with the same Medicare primary specialty in Oakland, CA — not a recommendation.
Other clinicians in Permanente Medical Group Inc
Medicare enrollment lists these clinicians in the same group practice — not a recommendation.
Clinician information
| Credential | NP |
|---|---|
| Graduation year | 2020 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1427621820 |
| 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