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

John Koslosky II

Individual provider Physician Assistant · NPI 1932895364

John Koslosky II is a Physician Assistant in Barrington, Illinois. Qualified in 2025, 1 year ago. Practices with Illinois Bone and Joint Institute, LLC, a 606-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
1
Licensed in
IL
In the registry since
2023
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Practice location Address checks out

27401 W Highway 22 Ste 125
Barrington, IL 60010-5934
Phone: (847) 381-0388
Fax: (847) 381-0811
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Physician Assistant (primary) Taxonomy 363A00000X (IL)

Record details

NPI number1932895364
Entity typeIndividual (Type 1)
GenderMale
Sole proprietorNo
NPI enumeratedApril 18, 2023
Last updated in NPPESMay 21, 2025
Certification dateMay 21, 2025
Mailing address900 Rand Rd Ste 300, Des Plaines, IL 60016-2359

Medicare enrollment

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

Medicare specialtyPHYSICIAN ASSISTANT
Medical schoolOTHER
Graduated 2025 (1 years in practice)
Group practice Illinois Bone And Joint Institute, Llc — 606 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
Practice locations2 on file with Medicare

Other providers in Barrington