Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. OSKAR ALEKSANDER ZARNOWSKI DO
NPI 1750084893
Internal Medicine in Park Ridge, IL

Q: What is Oskar Zarnowski's NPI number?

The NPI number for Oskar Zarnowski is 1750084893. It was assigned to this individual provider in the NPPES registry on March 27, 2023.

Q: What is Oskar Zarnowski's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Oskar Zarnowski was last updated on September 14, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 41 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since March 27, 2023PECOS Enrolled

1775 BALLARD RD, PARK RIDGE, IL 60068(847) 318-9340(847) 318-2966 Get Directions Write a Review

NPPES record last updated: September 14, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Sep 14, 2026, Jul 10, 2026, Jun 18, 2023 and 1 more (4 updates tracked since 2023).

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About Dr. Oskar Aleksander Zarnowski Do NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. OSKAR ALEKSANDER ZARNOWSKI DO (NPI 1750084893) is an individual internal medicine provider in Park Ridge, Illinois, licensed in Illinois (036.176388) and active in the NPI registry since March 2023. He is enrolled in Medicare PECOS and is a graduate of Nova Southeastern College Of Osteo Medicine (2023).

NPPES Registry Identity

NPI1750084893

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameDR. OSKAR ALEKSANDER ZARNOWSKICredential: DO

Location Address1775 BALLARD RDPark Ridge, IL 60068-1005

Mailing Address29373 Network PlChicago, IL 60673-1293 · (847) 390-5900 · Fax (847) 390-4757

Phone(847) 318-9340

Fax(847) 318-2966

Sole ProprietorNo

Medical School CMSNova Southeastern College Of Osteo MedicineGraduated 2023

Enumeration DateMarch 27, 2023

Last NPPES UpdateSeptember 14, 20264 updates tracked since enumeration

NPPES CertifiedSeptember 14, 2026

✔ NPI 1750084893 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in IL · 036.176388

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

1775 BALLARD RD, Park Ridge, IL 60068

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Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware, Oscar Health.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Oskar Aleksander Zarnowski Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID7315402518

PECOS Enrollment IDI20260717003612

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Oskar Zarnowski reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Lutheran General Hospital

0.3 mi

Cardiovascular Disease

1775 DEMPSTER ST
Park Ridge, IL 60068

Reassigned Medicare billing, Illinois enrollment
Medicare enrollment name: Advocate Health And Hospitals Corporation
4,870 clinicians in this Medicare group

NPI 1801809306 (847) 723-2210

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60068 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$138.86 typical visit price

range $60.08 – $183.39

Typical copayment $34.71 (range $15.02 – $45.84)

Most-billed visit code 99204

Established Patient

$105.70 typical visit price

range $18.97 – $148.12

Typical copayment $26.42 (range $4.74 – $37.03)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DANIELLE ALYSSA WALES MD

Family Medicine