Gregory P Witkowski, MD

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

• Northwestern Medicine Delnor Community Hospital Hospital · Geneva, IL · listed as Delnor Community Hospital
• Northwestern Medicine Central Dupage Hospital Hospital · Winfield, IL

Also affiliated with 1 inpatient rehabilitation facility, which CMS identifies by certification number only.

Colleagues at Central Dupage Physician Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1094 clinicians in the practice; 12 are shown here.

• Dr. Vanitha Pushpa Asokan, MD Physical Medicine & Rehabilitation Physician · Elk Grove Village, IL
• Alishia Davison, PA-C Physician Assistant · Joliet, IL
• Jessica Dy-Johnson, MD Hospitalist Physician · Orland Park, IL
• Miss. Melissa Fish, MD Family Medicine Physician · St Charles, IL
• Kim J Gehle, MD Pediatrics Physician · Wheaton, IL
• Bridget Agnes Gulling, MD Internal Medicine Physician · Winfield, IL
• Reid A. Kehoe, PSYD Clinical Neuropsychologist · Winfield, IL
• Salem Jad Makdah, MD Internal Medicine Physician · Orland Park, IL
• Dr. Avi Mazumdar, MD Neurology Physician · Winfield, IL
• Julianne Emily Pressley, PA-C Physician Assistant · Naperville, IL
• Dr. Imad Qayyum, MD Surgery Physician · Palos Heights, IL
• Karthik Subbu, MD Student in an Organized Health Care Education/Training Program · Geneva, IL

Other providers in Warrenville

• Mossub Mohamad Qatu, MD

  Individual Orthopaedic Foot and Ankle Surgery Physician · NPI 1538652664

  27650 Ferry Rd Ste 100, Warrenville, IL 60555-3846 · (630) 225-2663