Quick answers
- Which hospitals does Jack O. Stewart work at?
- Medicare's official clinician data lists Jack O. Stewart at 1 hospital: Providence St. Joseph Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jack O. Stewart see patients?
- Medicare's clinician data lists 1 practice location in Orange, CA. Call before your visit to confirm the address.
- What is Jack O. Stewart's specialty?
- Medicare lists Pulmonary Disease as the primary specialty, and also Critical Care (Intensivists) and Internal Medicine.
- Does Jack O. Stewart accept Medicare assignment?
- Yes. Medicare's clinician data says Jack O. Stewart 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 Jack O. Stewart offer telehealth?
- Medicare's clinician data says Jack O. Stewart offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for Jack O. Stewart?
- (714) 361-6600, as listed in official Medicare / NPI Registry data.
- What is Jack O. Stewart's NPI number?
- 1942278452. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jack O. Stewart works
Medicare's Facility Affiliation Data lists Jack O. Stewart at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Providence St. Joseph HospitalOrange, CA · Acute Care Hospital · CCN 050069
Practice locations
Addresses where Jack O. Stewart is enrolled with Medicare (CMS data updated 2026-10-02).
- 1010 W La Veta Ave, Suite 750Orange, CA 92868 (714) 361‑6600
Group practices
Medicare enrollment lists Jack O. Stewart as a member of this group (CMS data updated 2026-10-02).
- Comprehensive Pulmonary and Primary Care of Orange County9 clinicians in the group
Specialties
Other pulmonologists in Orange
Clinicians with the same Medicare primary specialty in Orange, CA — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Northwestern University Feinberg Medical School |
| Graduation year | 1979 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1942278452 |
| 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