John Koslosky
Physician Assistant · Barrington, IL
John Koslosky is a physician assistant with a practice address in Barrington, Illinois, and NPI 1932895364, issued on Apr 18, 2023. Check the license with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- John Koslosky
- Primary taxonomy
- Physician Assistant 363A00000X
- Practice location
- 27401 W Highway 22 Ste 125, Barrington, IL 60010
- Phone
- (847) 381-0388
- Enumerated
- Apr 18, 2023
- Record last updated
- May 21, 2025
- Fax
- (847) 381-0811
- Medicare enrollment
- Enrolled (PECOS I20250814004064); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 4,926 in Illinois → Look up another NPI →
Also registered at 27401 W Highway 22 Ste 125
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify John Koslosky in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Bills Medicare through one group practice
- Illinois Bone And Joint Institute, LLCBannockburn, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
John Koslosky among 4,926 physician assistant records in Illinois
John Koslosky is one of 4,926 physician assistant records with a practice address in Illinois. 82% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2023, is newer than 78% of them.
- NPI issued2023 · 78% of these records are older, 17% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2025 · median 2019 among the 3,407 with a school on file
- Record last updated2025 · 35% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
12 physician assistant records list a practice address in Barrington
They are 12 of the 756 NPPES records with a practice address in Barrington, and 4,926 physician assistant records in Illinois.
All 4,926 in Illinois → Every provider in Barrington → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Latisha Anami, PA-CBarrington, IL 600101629481411
- Lucy Buhr, PA-CBarrington, IL 600101487174249
- Allison CarlsonBarrington, IL 600101093184087
- Daniel KorpelaBarrington, IL 600101942782297
- Elena Medyanik, PHYSICIANS ASSISTANLake Barrington, IL 600101811547375
- Meghan Murray, PHYSICIAN ASSISTANTBarrington, IL 600101376067736
- Samantha Pohlman, PALake Barrington, IL 600101487160131
- Amy Richter, PA-CLake Barrington, IL 600101063463925
Common questions
What is John Koslosky's NPI number?
John Koslosky's National Provider Identifier (NPI) is 1932895364, issued on Apr 18, 2023. An NPI identifies a provider in billing; it is not a license.
Where is John Koslosky located?
The NPPES record lists a practice address at 27401 W Highway 22 Ste 125, Barrington, IL, 60010. Phone: (847) 381-0388. Providers update this record themselves, so call before visiting.
How can I verify John Koslosky's license?
Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
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.