Quick answers
- Which hospitals does Madalyn Rivas work at?
- Medicare's official clinician data lists Madalyn Rivas at 1 hospital: Adventist Health Lodi Memorial. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Madalyn Rivas see patients?
- Medicare's clinician data lists 3 practice locations, including Los Gatos, CA, Simi Valley, CA and Los Altos, CA. Call before your visit to confirm the address.
- What is Madalyn Rivas's specialty?
- Medicare lists Hospitalist as the primary specialty.
- Does Madalyn Rivas accept Medicare assignment?
- Yes. Medicare's clinician data says Madalyn Rivas 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 Madalyn Rivas?
- (408) 739-6000, as listed in official Medicare / NPI Registry data.
- What is Madalyn Rivas's NPI number?
- 1447830187. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Madalyn Rivas works
Medicare's Facility Affiliation Data lists Madalyn Rivas at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Adventist Health Lodi MemorialLodi, CA · Acute Care Hospital · CCN 050336
Practice locations
Addresses where Madalyn Rivas is enrolled with Medicare (CMS data updated 2026-10-02).
- 15400 Los Gatos BlvdLos Gatos, CA 95032 (408) 739‑6000
- 2975 Sycamore DrSimi Valley, CA 93065 (805) 955‑6000
- 370 Distel CirLos Altos, CA 94022 (650) 254‑5200
Group practices
Medicare enrollment lists Madalyn Rivas as a member of these groups (CMS data updated 2026-10-02).
- Sutter Bay Medical Foundation3,829 clinicians in the group
- Galen Inpatient Physicians PC1,077 clinicians in the group
Specialties
- Hospitalistprimary
Other hospitalists in California
Clinicians with the same Medicare primary specialty in California — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2021 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1447830187 |
| 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