John Stephen Sowinski, MD
Diagnostic Radiology Physician · San Francisco, CA
John Stephen Sowinski, MD is a diagnostic radiology physician with a practice address in San Francisco, California, and NPI 1881190627, issued on Apr 2, 2018. Check the license (California A187039, as entered in NPPES) on the Medical Board of California; the Medicare figures below come from public CMS files.
- Name
- John Stephen Sowinski
- Credential
- MD
- Primary taxonomy
- Diagnostic Radiology Physician 2085R0202X
- License numbers
- A187039 CA
2026-00784 NC
Self-reported in NPPES; status is on the state search - Practice location
- 505 Parnassus Ave, San Francisco, CA 94143
- Phone
- (415) 502-2673
- Enumerated
- Apr 2, 2018
- Record last updated
- Mar 19, 2026
- Medicare enrollment
- Enrolled (PECOS I20260330000273); accepts Medicare assignment
- Medical or professional school
- Indiana University School Of Medicine, 2018
- Entity
- Type 1 · individual
8 nearest diagnostic radiology physician records → All 4,500 in California → Look up another NPI →
Also registered at 505 Parnassus Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Alexander Aabedi, MDStudent in an Organized Health Care Education/Training Program1245971480
- Kathryn Aaronson, RN, CPNPPediatric Nurse Practitioner1992030951
- Sharon AbadaStudent in an Organized Health Care Education/Training Program1003492844
- Abul Abbas, MBBSAnatomic Pathology Physician1881652964
- Jesse Abelson, MDInternal Medicine Physician1083843817
- Rhonald AbitonaAcute Care Nurse Practitioner1164993473
Verify John Stephen Sowinski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMedical Board of California
Search for license A187039Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 91.9 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).
2 hospitals and group practices
- Southeastern Regional Medical CenterLumberton, NC · Acute Care Hospitals2 of 5 stars
- Edison Radiology Group PA Jfk Medical CenterEdison, NJ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through); hospitals matched to CMS Hospital General Information (Care Compare) (data.cms.gov). Star ratings are CMS hospital ratings, not ratings of this provider.
John Stephen Sowinski among 4,500 diagnostic radiology physician records in California
John Stephen Sowinski, MD is one of 4,500 diagnostic radiology physician records with a practice address in California. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 88% of them.
- NPI issued2018 · 88% of these records are older, 9% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 70% of these records are
- Graduated2018 · median 2004 among the 3,130 with a school on file
- Record last updated2026 · 60% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2085R0202X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Diagnostic Radiology Physician providers in California
There are 4,500 diagnostic radiology physician records in California.
All 4,500 in California → Every provider in San Francisco → Diagnostic Radiology Physician nationwide →
The 8 diagnostic radiology physician records with the nearest ZIP codes
- Ronald Arenson, MDSan Francisco, CA 941431063477750
- Diana Baker, M.D.San Francisco, CA 941431790730984
- Cynthia Chin, M.D.San Francisco, CA 941431447292404
- Rita Freimanis, MDSan Francisco, CA 941431508840802
- Charles Gooding, MDSan Francisco, CA 941431497710214
- Roy Gordon, M.D.San Francisco, CA 941431881636876
- Bonnie Joe, M.D.San Francisco, CA 941431710927314
- Theodore Lee, M.D.San Francisco, CA 941431083656193
Common questions
What is John Stephen Sowinski, MD's NPI number?
John Stephen Sowinski, MD's National Provider Identifier (NPI) is 1881190627, issued on Apr 2, 2018. An NPI identifies a provider in billing; it is not a license.
Where is John Stephen Sowinski, MD located?
The NPPES record lists a practice address at 505 Parnassus Ave, San Francisco, CA, 94143. Phone: (415) 502-2673. Providers update this record themselves, so call before visiting.
How can I verify John Stephen Sowinski, MD's license?
NPPES lists California license number A187039, 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.
What is John Stephen Sowinski, MD's MIPS final score?
The 2023 MIPS final score is 91.9 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.