Dr. Tamer Atassi, 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.

• Advocate Christ Hospital & Medical Center Hospital · Oak Lawn, IL · listed as Advocate Christ Medical Center
• Silver Cross Hospital And Medical Centers Hospital · New Lenox, IL
• Northwestern Medicine Central Dupage Hospital Hospital · Winfield, IL

Colleagues at Gi Partners of Illinois PLLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 38 clinicians in the practice; 12 are shown here.

• Dr. Philip N Adjei, MD Gastroenterology Physician · Libertyville, IL
• Laura Atkinson, FNP-C Family Nurse Practitioner · New Lenox, IL
• Kamran Ayub, MD Gastroenterology Physician · Oak Lawn, IL
• Dr. Anshuman Chawla, MD Gastroenterology Physician · Downers Grove, IL
• Dr. James Ralph Clark, MD Gastroenterology Physician · Downers Grove, IL
• Dr. Dale L. Coy, MD Gastroenterology Physician · Lake Barrington, IL
• Jessica Marie Dakhoul, PA-C Physician Assistant · New Lenox, IL
• Dr. Lesley Kristine Dawravoo, MD Gastroenterology Physician · Maywood, IL
• James Lewis Ferguson, CNP Nurse Practitioner · McHenry, IL
• Dr. Dafna W. Gordon, MD Gastroenterology Physician · Lake Barrington, IL
• Nistha Rawal, DO Gastroenterology Physician · Lake Barrington, IL
• Mrs. Kassandra Nicole Shannon Nurse Practitioner · Lake Barrington, IL

Other providers in Joliet

• Dr. Bachar Hamad, MD

  Individual Gastroenterology Physician · NPI 1780690040

  330 Madison St Ste 200, Joliet, IL 60435-6569 · (630) 717-2600

• Dr. Basant K Jhawar, MD

  Individual Gastroenterology Physician · NPI 1205878048

  1423 Essington Rd, Joliet, IL 60435-2873 · (815) 741-8551

• Faizan Ali Khan, DO

  Individual Gastroenterology Physician · NPI 1194022541

  330 Madison St Ste 200, Joliet, IL 60435-6569 · (630) 717-2600

• Dr. Riten Harshad Sheth, MD

  Individual Gastroenterology Physician · NPI 1578664728

  3077 W Jefferson St Ste 104, Joliet, IL 60435-5262 · (815) 744-6722