Jack O. Stewart, M.D.
Pulmonary Disease Physician · Orange, CA
Jack O. Stewart, M.D. is a pulmonary disease physician with a practice address in Orange, California, and NPI 1942278452, issued on Mar 9, 2006. Check the license (California G48397, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- Jack O. Stewart
- Credential
- M.D.
- Primary taxonomy
- Pulmonary Disease Physician 207RP1001X
- License number
- G48397 CA
Self-reported in NPPES; status is on the state search - Practice location
- 1310 W Stewart Dr Ste 408, Orange, CA 92868
- Phone
- (714) 639-9401
- Enumerated
- Mar 9, 2006
- Record last updated
- Jul 21, 2022
- Fax
- (714) 919-8807
- Medicare enrollment
- Enrolled (PECOS I20080122000823); accepts Medicare assignment
- Medical or professional school
- Northwestern University Feinberg Medical School, 1979
- Entity
- Type 1 · individual
8 nearest pulmonary disease physician records → All 1,443 in California → Look up another NPI →
Verify Jack O. Stewart in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license G48397Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2.6 times the Medicare Part D claims of the average pulmonary disease physician in 2024
3,775 Medicare Part D claims for 642 beneficiaries, against an average of 1,425 among the 11,596 providers of this specialty who prescribed in Part D.
Most prescribed
- Trelegy Ellipta624 claims
- Prednisone477 claims
- Montelukast Sodium344 claims
- Albuterol Sulfate Hfa266 claims
- Breo Ellipta142 claims
- Levofloxacin122 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The practice group's MIPS final score for 2023 (Medicare payment program): 80.4 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $3,011.02
115 payments; by number, the most common kind was food and beverage; the largest payer was GlaxoSmithKline, LLC. The 8,806 providers of this specialty with any payment received $5,159.88 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Comprehensive Pulmonary And Primary Care OF Orange CountyOrange, CA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Jack O. Stewart among 1,443 pulmonary disease physician records in California
Jack O. Stewart, M.D. is one of 1,443 pulmonary disease physician records with a practice address in California. 84% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 7% of them.
- NPI issued2006 · 7% of these records are older, 51% newer
- In a Medicare fileYes · 84% of these records are
- In the CMS Doctors and Clinicians fileYes · 74% of these records are
- Graduated1979 · median 2002 among the 1,061 with a school on file
- Record last updated2022 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RP1001X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Pulmonary Disease Physician providers in California
There are 1,443 pulmonary disease physician records in California.
All 1,443 in California → Every provider in Orange → Pulmonary Disease Physician nationwide →
The 8 pulmonary disease physician records with the nearest ZIP codes
- Fatima Ajaz, M.DOrange, CA 928681477731461
- Matthew Brenner, MDOrange, CA 928681457431538
- Raymond Casciari, M.D.Orange, CA 928681467420273
- Henri G Colt, MDOrange, CA 928681295815389
- Panch Jeyakumar, M.D.Orange, CA 928681629047964
- James Law, M.D.Orange, CA 928681861460370
- James Lineback, MDOrange, CA 928681922210087
- Mahmoud Moammar, MDOrange, CA 928681952500696
Common questions
What is Jack O. Stewart, M.D.'s NPI number?
Jack O. Stewart, M.D.'s National Provider Identifier (NPI) is 1942278452, issued on Mar 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Jack O. Stewart, M.D. located?
The NPPES record lists a practice address at 1310 W Stewart Dr Ste 408, Orange, CA, 92868. Phone: (714) 639-9401. Providers update this record themselves, so call before visiting.
How can I verify Jack O. Stewart, M.D.'s license?
NPPES lists California license number G48397, as entered by the provider. Search the Medical Board of California at https://www.mbc.ca.gov/License-Verification/default.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Jack O. Stewart, M.D. prescribe under Medicare Part D?
In 2024, Jack O. Stewart, M.D. had 3,775 Medicare Part D claims for 642 beneficiaries; the average among pulmonary disease physician prescribers was 1,425. Part D covers Medicare prescriptions only.
What is Jack O. Stewart, M.D.'s MIPS final score?
The 2023 MIPS final score is 80.4 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.