Jack O. Stewart, M.D.
NPI 1942278452ActiveIndividual· Internal Medicine, Pulmonary Disease· Orange, CA
Internal Medicine, Pulmonary Disease (M.D.) in Orange, California, trained at Northwestern University Feinberg Medical School (class of 1979). Their prescriptions cost Medicare Part D more than their services did: $2,835,659 for 3,775 claims, against $159,032 paid for services in 2024. Insmed, Inc. was the largest of 27 companies reporting payments in 2025, $2,670 in all, mostly food and beverage.
Overview
| NPI | 1942278452 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Mar 9, 2006 |
| Last updated in NPPES | Oct 25, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Pulmonary Disease Primary | 207RP1001X | G48397 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Pulmonary Disease (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 512 |
|---|---|
| Services billed | 2,129 across 29 procedure codes |
| Paid by Medicare | $159,032 |
Part D prescriptions in 2024
| Prescriptions (claims) | 3,775 · 5,885 30-day fills |
|---|---|
| Patients | 642 |
| Total drug cost | $2,835,659 |
| Generic share | 59% of claims |
Education and affiliations
| Medical school | Northwestern University Feinberg Medical School |
|---|---|
| Graduation year | 1979 |
| Medicare specialty | Pulmonary Disease |
| Secondary specialties | Critical Care (Intensivists), Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Comprehensive Pulmonary and Primary Care of Orange CountyOrange, CA · 9 clinicians
Hospital affiliation
- Providence St. Joseph HospitalOrange, CA
Industry payments (Open Payments)
- 2025$2,670 · 128 payments from 27 companies
- 2024$3,011 · 130 payments from 26 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Insmed, Inc. | $332.19 | 13 |
| Glaxosmithkline, LLC. | $278.23 | 19 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $278.07 | 9 |
| Merck Sharp & Dohme LLC | $206.44 | 8 |
| Astrazeneca Pharmaceuticals LP | $183.48 | 27 |
What the 2025 payments were for
- Food and Beverage$2,653 · 127 payments
- Education$17.38 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 25 pulmonologists in Orange · All pulmonologists in California