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

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: September 27, 2026.

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

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
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

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

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.

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.

Family Medicine
1775 BALLARD RD
PARK RIDGE, IL 60068
Student in an Organized Health Care Education/Training Program
1775 BALLARD RD
PARK RIDGE, IL 60068
Internal Medicine
1775 BALLARD RD
PARK RIDGE, IL 60068
Internal Medicine
1775 BALLARD RD
PARK RIDGE, IL 60068
Student in an Organized Health Care Education/Training Program
1775 BALLARD RD
PARK RIDGE, IL 60068
Internal Medicine (Geriatric Medicine)
1775 BALLARD RD
PARK RIDGE, IL 60068
Internal Medicine
1775 BALLARD RD
PARK RIDGE, IL 60068
Internal Medicine
1775 BALLARD RD
PARK RIDGE, IL 60068

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

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.

Where is Oskar Zarnowski located?

Oskar Zarnowski practices at 1775 Ballard Rd, Park Ridge, IL 60068. The listed phone number is (847) 318-9340.

What is Oskar Zarnowski's specialty?

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

Is Oskar Zarnowski enrolled in Medicare?

Yes. Oskar Zarnowski is registered in the Medicare PECOS enrollment system.

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 21 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.