Dr. Joseph Ahn, 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.

• Northshore University Healthsystem - Evanston Hospital Hospital · Evanston, IL · listed as North Shore University Healthsystems Evanston Hospital

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. Matangi Priyasri Bala, MD Anesthesiology Physician · Hoffman Estates, IL
• Richard L. Brickner, MD Anesthesiology Physician · Highland Park, IL
• Dr. Cynthia Ann Brincat, MD Obstetrics & Gynecology Physician · Skokie, IL
• Carol A Crews, LCSW Clinical Social Worker · Lombard, IL
• Dava Lynn Grundhoefer, MD Anesthesiology Physician · Arlington Heights, IL
• Dorothy Lam, MD Diagnostic Radiology Physician · Chicago, IL
• Dr. Geeta Maker-Clark, MD Family Medicine Physician · Evanston, IL
• Amy D. Rizman, PA-C Physician Assistant · Zion, IL
• Diane Mary Urbane, CRNA Certified Registered Nurse Anesthetist · Evanston, IL
• Irmina Valinovic, MD Internal Medicine Physician · Evanston, IL
• Kara Ann Vormittag, MD Sports Medicine (Family Medicine) Physician · Skokie, IL
• Dr. Lawrence Blueford Yeager IV, MD Obstetrics & Gynecology Physician · Skokie, IL

Other providers in Portland

• Dr. Jeffrey Smith Albaugh, MD

  Individual Gastroenterology Physician · NPI 1184626087

  1111 NE 99th Ave Ste 301, Portland, OR 97220-9428 · (503) 963-2707

• Dr. Deron Trent Amador, MD

  Individual Gastroenterology Physician · NPI 1841653490

  9701 SW Barnes Rd Ste 300, Portland, OR 97225-6689 · (503) 297-8081

• Dr. Manisha Apte, MD

  Individual Gastroenterology Physician · NPI 1851745129

  9701 SW Barnes Rd Ste 300, Portland, OR 97225-6689 · (503) 297-8081

• Tan Attila, MD

  Individual Gastroenterology Physician · NPI 1306978853

  3181 SW Sam Jackson Park Rd, Portland, OR 97239-3011 · (503) 494-8417