Quick answers
- Which hospitals does Jonathan A. Rosaasen work at?
- Medicare's official clinician data lists Jonathan A. Rosaasen at 2 hospitals: Adventist Health Simi Valley and Los Robles Hospital & Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jonathan A. Rosaasen see patients?
- Medicare's clinician data lists 2 practice locations, including Thousand Oaks, CA. Call before your visit to confirm the address.
- What is Jonathan A. Rosaasen's specialty?
- Medicare lists Family Practice as the primary specialty.
- Does Jonathan A. Rosaasen accept Medicare assignment?
- Yes. Medicare's clinician data says Jonathan A. Rosaasen 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.
- Does Jonathan A. Rosaasen offer telehealth?
- Medicare's clinician data says Jonathan A. Rosaasen offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Jonathan A. Rosaasen?
- (805) 492-1015, as listed in official Medicare / NPI Registry data.
- What is Jonathan A. Rosaasen's NPI number?
- 1528171352. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jonathan A. Rosaasen works
Medicare's Facility Affiliation Data lists Jonathan A. Rosaasen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Adventist Health Simi ValleySimi Valley, CA · Acute Care Hospital · CCN 050236
- Los Robles Hospital & Medical CenterThousand Oaks, CA · Acute Care Hospital · CCN 050549
Practice locations
Addresses where Jonathan A. Rosaasen is enrolled with Medicare (CMS data updated 2026-10-02).
- 430 E Avenida De Los Arboles, Suite 204Thousand Oaks, CA 91360
- 430 E Avenidadelosarboles, Suite 204Thousand Oaks, CA 91360 (805) 492‑1015
Group practices
Medicare enrollment lists Jonathan A. Rosaasen as a member of this group (CMS data updated 2026-10-02).
- Rosaasen Family Medicine, Inc.2 clinicians in the group
Specialties
- Family Practiceprimary
Other family doctors in Thousand Oaks
Clinicians with the same Medicare primary specialty in Thousand Oaks, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Loma Linda University School Of Medicine |
| Graduation year | 2002 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1528171352 |
| 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