Dr. Shahid M. Ahsan, MD

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.

• Edward Hospital Hospital · Naperville, IL
• Elmhurst Memorial Hospital Hospital · Elmhurst, IL

Colleagues at Endeavor Health Medical Group

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3348 clinicians in the practice; 12 are shown here.

• Dr. Kevin Dale Boatwright, MD Internal Medicine Physician · Glenview, IL
• Bruce Earl Brockstein, MD Medical Oncology Physician · Evanston, IL
• Dr. Regan Alene Christopoulos, MD Internal Medicine Physician · Gurnee, IL
• Dr. Daniel D Gauthier, DO Family Medicine Physician · Sandwich, IL
• Dr. Katherine A Kotcherian, MD Internal Medicine Physician · Arlington Heights, IL
• Gerald E Lynch, MD Surgery Physician · Oak Park, IL
• Dr. John D Ortega, MD Facial Plastic Surgery Physician · Elmhurst, IL
• Forrest James Robinson, DO Family Medicine Physician · Oak Park, IL
• Vineet Singla, DO Family Medicine Physician · Addison, IL
• George Stathopoulos, MD Gastroenterology Physician · Elmhurst, IL
• Dr. Samir D Undevia, MD Hematology & Oncology Physician · Naperville, IL
• Nancy Erin Velasco, APN-CNP Adult Health Nurse Practitioner · Arlington Heights, IL

Other providers in Naperville

• Edward Hospital

  Organization Pulmonary Disease Physician · NPI 1720099922

  801 S Washington St, Naperville, IL 60540-7430 · (630) 527-7352

• Dr. Edward Robert Kessler, MD

  Individual Pulmonary Disease Physician · NPI 1427205699

  100 Spalding Dr Ste 200, Naperville, IL 60540-6552 · (630) 355-8776

• Dr. David McElligott, MD

  Individual Pulmonary Disease Physician · NPI 1578579850

  100 Spalding Dr Ste 200, Naperville, IL 60540-6550 · (630) 355-8776

• Dr. Jasshan Mahesh Mehrotra, MD

  Individual Pulmonary Disease Physician · NPI 1194135368

  100 Spalding Dr Ste 200, Naperville, IL 60540-6552 · (630) 355-8776