Quick answers
- Which hospitals does Julia A. Ondarza work at?
- Medicare's official clinician data lists Julia A. Ondarza at 2 hospitals: John Muir Medical Center - Walnut Creek Campus and Stanford Health Care. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Julia A. Ondarza see patients?
- Medicare's clinician data lists 3 practice locations, including Santa Clarita, CA, Walnut Creek, CA and Stanford, CA. Call before your visit to confirm the address.
- What is Julia A. Ondarza's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does Julia A. Ondarza accept Medicare assignment?
- Yes. Medicare's clinician data says Julia A. Ondarza 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 Julia A. Ondarza offer telehealth?
- Medicare's clinician data says Julia A. Ondarza offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Julia A. Ondarza?
- (972) 807-3696, as listed in official Medicare / NPI Registry data.
- What is Julia A. Ondarza's NPI number?
- 1013537794. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Julia A. Ondarza works
Medicare's Facility Affiliation Data lists Julia A. Ondarza at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA · Acute Care Hospital · CCN 050180
- Stanford Health CareStanford, CA · Acute Care Hospital · CCN 050441
Practice locations
Addresses where Julia A. Ondarza is enrolled with Medicare (CMS data updated 2026-10-02).
- 25775 McBean Pkwy, Suite 106Santa Clarita, CA 91355 (972) 807‑3696
- 2637 Shadelands Dr, Suite A2Walnut Creek, CA 94598 (925) 430‑5335
- 300 Pasteur DrStanford, CA 94305 (650) 723‑4000
Group practices
Medicare enrollment lists Julia A. Ondarza as a member of these groups (CMS data updated 2026-10-02).
- Stanford Health Care3,122 clinicians in the group
- Brandon McCutcheon MD PC5 clinicians in the group
- Nextgen RPM LLC5 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Santa Clarita
Clinicians with the same Medicare primary specialty in Santa Clarita, CA — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 2019 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1013537794 |
| 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