Katarzyna Slys, PA-C
Physician Assistant · Naperville, IL
Katarzyna Slys, PA-C is a physician assistant with a practice address in Naperville, Illinois, and NPI 1336757459, issued on Jul 14, 2020. Check the license (Illinois 085.007231, as entered in NPPES) with the Illinois board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Katarzyna Slys
- Credential
- PA-C
- Primary taxonomy
- Physician Assistant 363A00000X
- License number
- 085.007231 IL
Self-reported in NPPES; status is on the state search - Practice location
- 230 Martin Ave, Naperville, IL 60540
- Phone
- (630) 848-1200
- Enumerated
- Jul 14, 2020
- Record last updated
- Dec 19, 2025
- Fax
- (630) 848-1208
- Medicare enrollment
- Enrolled (PECOS I20260422000604); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 4,926 in Illinois → Look up another NPI →
Also registered at 230 Martin Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Katarzyna Slys in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Illinois board licenses this profession
Search for license 085.007231Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
19% fewer Medicare Part D claims than the average physician assistant in 2024
676 Medicare Part D claims for 44 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D. Brand-name drugs were 3% of claims.
Most prescribed
- Sertraline Hcl53 claims
- Quetiapine Fumarate51 claims
- Lorazepam39 claims
- Alprazolam38 claims
- Buspirone Hcl37 claims
- Venlafaxine Hcl Er37 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.
Industry payments in 2024: $1,000.13
41 payments; by number, the most common kind was food and beverage; the largest payer was Iti, Inc. (d/b/a Intra-Cellular Therapies, Inc.). The 64,719 providers of this specialty with any payment received $841.65 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
- Prizm Behavioral Services, PCNaperville, IL
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katarzyna Slys among 4,926 physician assistant records in Illinois
Katarzyna Slys, PA-C 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 2020, is newer than 58% of them.
- NPI issued2020 · 58% of these records are older, 34% newer
- In a Medicare fileYes · 82% of these records are
- In the CMS Doctors and Clinicians fileYes · 69% of these records are
- Graduated2019 · 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).
117 physician assistant records list a practice address in Naperville
They are 117 of the 4,634 NPPES records with a practice address in Naperville, and 4,926 physician assistant records in Illinois.
All 4,926 in Illinois → Every provider in Naperville → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Samantha Adamczyk, PA-CNaperville, IL 605401093016016
- Christina Bartz, PA-CNaperville, IL 605401104826361
- Samuel Cordova, PA-CNaperville, IL 605401326137225
- Thad Cuasay, PA-CNaperville, IL 605401730112277
- Sara Dabrowski, PA-CNaperville, IL 605401124018817
- John Paul Dehler, PA-CNaperville, IL 605401982705166
- Ryan Enger, PA-CNaperville, IL 605401962556365
- Kathryn Keeley, PA-CNaperville, IL 605401912048752
Common questions
What is Katarzyna Slys, PA-C's NPI number?
Katarzyna Slys, PA-C's National Provider Identifier (NPI) is 1336757459, issued on Jul 14, 2020. An NPI identifies a provider in billing; it is not a license.
Where is Katarzyna Slys, PA-C located?
The NPPES record lists a practice address at 230 Martin Ave, Naperville, IL, 60540. Phone: (630) 848-1200. Providers update this record themselves, so call before visiting.
How can I verify Katarzyna Slys, PA-C's license?
NPPES lists Illinois license number 085.007231, as entered by the provider. Search the Illinois board that licenses this profession; the NPPES record confirms identity only.
How much does Katarzyna Slys, PA-C prescribe under Medicare Part D?
In 2024, Katarzyna Slys, PA-C had 676 Medicare Part D claims for 44 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions 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.