Jason Zimmermann, 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.

• Advocate Christ Hospital & Medical Center Hospital · Oak Lawn, IL · listed as Advocate Christ Medical Center

Colleagues at Advocate Health and Hospitals Corporation

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3079 clinicians in the practice; 12 are shown here.

• Mr. Adam Estrada, NURSEPRACTITIONER Family Nurse Practitioner · Yorkville, IL
• Dr. Daniel Marcos Gonzalez, MD Cardiovascular Disease Physician · Oak Lawn, IL
• Dr. Christie L Hancock, MD Internal Medicine Physician · Park Ridge, IL
• Steven Kluck, PA-C Physician Assistant · Blue Island, IL
• Jessica Leigh Koren, DO Obstetrics & Gynecology Physician · Park Ridge, IL
• Andrew Kovachevich, ATC Athletic Trainer · South Elgin, IL
• Eric Warren Moffet, MD Neurocritical Care Physician · Park Ridge, IL
• Philip Vasilios Papaioannou Hospitalist Physician · Oak Lawn, IL
• William Park, MD Pain Medicine (Anesthesiology) Physician · Woodland Hills, CA
• Kyla Phu, APN Family Nurse Practitioner · New Berlin, WI
• Trevor Roston, MD Hospitalist Physician · Elgin, IL
• Dr. Brianna Carolyn Sohl, MD Obstetrics & Gynecology Physician · Park Ridge, IL

Other providers in Oak Lawn

• Suburban General Surgery Ltd

  Organization Surgery Physician · NPI 1003977901

  4700 W 95th St Ste 308, Oak Lawn, IL 60453 · (708) 425-6370

• Dr. Antone John Tatooles, MD

  Individual Surgery Physician · NPI 1477548170

  4400 W 95th St Ste 308, Oak Lawn, IL 60453-2660 · (708) 346-4040

• Rodney Howard Thill, MD

  Individual Surgery Physician · NPI 1174620157

  4500 W 95th St Ste 413, Oak Lawn, IL 60452 · (708) 346-4055

• Dr. Yalaunda M. Thomas, MD

  Individual Surgery Physician · NPI 1275638504

  4440 W 95th St, Oak Lawn, IL 60453-2600 · (708) 684-4393