Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Jack O. Stewart, MD

Individual provider Pulmonary Disease Physician · NPI 1942278452

Jack O. Stewart, MD is a Pulmonary Disease in Orange, California. Graduated from Northwestern University Feinberg Medical School in 1979, 47 years ago. Accepts Medicare assignment. Licensed in California.

Years since qualifying
47
Trained at
Northwestern University Feinberg Medical School
Licensed in
CA
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

1310 W Stewart Dr Ste 408
Orange, CA 92868-3855
Phone: (714) 639-9401
Fax: (714) 919-8807
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Pulmonary Disease Physician (primary) Taxonomy 207RP1001X · Licence G48397 (CA)

Record details

NPI number1942278452
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 9, 2006
Last updated in NPPESJuly 21, 2022
Mailing address1010 W La Veta Ave Ste 750, Orange, CA 92868-4312

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyPULMONARY DISEASE
Also practisesCRITICAL CARE (INTENSIVISTS), INTERNAL MEDICINE
Medical schoolNORTHWESTERN UNIVERSITY FEINBERG MEDICAL SCHOOL
Graduated 1979 (47 years in practice)
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

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