Oskar Aleksander Zarnowski, DO
Internal Medicine Physician · Park Ridge, IL
Oskar Aleksander Zarnowski, DO is an internal medicine physician with a practice address in Park Ridge, Illinois, and NPI 1750084893, issued on Mar 27, 2023. Check the license (Illinois 036.176388, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the Medicare figures below come from public CMS files.
- Name
- Oskar Aleksander Zarnowski
- Credential
- DO
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 036.176388 IL
Self-reported in NPPES; status is on the state search - Practice location
- 1775 Ballard RD, Park Ridge, IL 60068
- Phone
- (847) 318-9340
- Enumerated
- Mar 27, 2023
- Record last updated
- Jul 10, 2026
- Fax
- (847) 318-2966
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →
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Verify Oskar Aleksander Zarnowski in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
Search for license 036.176388Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
94% fewer Medicare Part D claims than the average internal medicine physician in 2024
188 Medicare Part D claims for 67 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium15 claims
- Amlodipine Besylate13 claims
- Gabapentin12 claims
- Rosuvastatin Calcium12 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.
Oskar Aleksander Zarnowski among 7,238 internal medicine physician records in Illinois
Oskar Aleksander Zarnowski, DO is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% 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 82% of them.
- NPI issued2023 · 82% of these records are older, 13% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileNo · 50% of these records are
- Record last updated2026 · 47% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
163 internal medicine physician records list a practice address in Park Ridge
They are 163 of the 2,577 NPPES records with a practice address in Park Ridge, and 7,238 internal medicine physician records in Illinois.
All 7,238 in Illinois → Every provider in Park Ridge → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Voula Asimacopoulos, MDPark Ridge, IL 600681114920824
- Howard Becker, MDPark Ridge, IL 600681245269794
- Mark Conley, D.O.Park Ridge, IL 600681366471856
- Maribeth December, M.D.Park Ridge, IL 600681245275635
- Michael Greising, MDPark Ridge, IL 600681629071329
- Thomas Holmes, M.D.Park Ridge, IL 600681689603110
- Jaroslaw Leszczak, MDPark Ridge, IL 600681588606222
- Andrey Lev-Weissberg, MDPark Ridge, IL 600681245206655
Common questions
What is Oskar Aleksander Zarnowski, DO's NPI number?
Oskar Aleksander Zarnowski, DO's National Provider Identifier (NPI) is 1750084893, issued on Mar 27, 2023. An NPI identifies a provider in billing; it is not a license.
Where is Oskar Aleksander Zarnowski, DO located?
The NPPES record lists a practice address at 1775 Ballard RD, Park Ridge, IL, 60068. Phone: (847) 318-9340. Providers update this record themselves, so call before visiting.
How can I verify Oskar Aleksander Zarnowski, DO's license?
NPPES lists Illinois license number 036.176388, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Oskar Aleksander Zarnowski, DO prescribe under Medicare Part D?
In 2024, Oskar Aleksander Zarnowski, DO had 188 Medicare Part D claims for 67 beneficiaries; the average among internal medicine physician prescribers was 3,176. 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.