John Koslosky
NPI 1932895364 · Physician Assistant · Barrington, IL
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Koslosky is a Physician Assistant provider in Barrington, IL (NPI 1932895364).
Provider details
- NPI number
- 1932895364
- Entity type
- Individual
- Primary specialty
- Physician AssistantPhysician Assistants & Advanced Practice Nursing Providers
- Sex
- Male
- Sole proprietor
- No
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
3 yrs in NPPES registry
- Profile completeness38% of score
83% of core fields populated
- Practice footprint23% of score
1 documented practice location
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
Practice location
Mailing address
Registry dates
- Enumerated
- 2023-04-18
- Last updated
- 2025-05-21
- Certified
- 2025-05-21
Frequently asked questions
- What is John Koslosky's NPI number?
- John Koslosky's National Provider Identifier (NPI) is 1932895364, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Koslosky's specialty?
- John Koslosky is listed in the NPPES registry with a primary specialty of Physician Assistant (Physician Assistants & Advanced Practice Nursing Providers).
- Where is John Koslosky located?
- John Koslosky's practice location on file with NPPES is 27401 W Highway 22 Ste 125, Barrington, IL 60010-5934.
- What is John Koslosky's phone number?
- The practice phone number listed in the NPPES registry for John Koslosky is (847) 381-0388.
- Does John Koslosky accept Medicare?
- John Koslosky is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Koslosky's NPI active?
- Yes — John Koslosky's NPI (1932895364) is active in the NPPES registry as of the last update on 2025-05-21.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.