Jennifer L Van Horn, AOCNS

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.

• Banner North Colorado Medical Center Hospital · Greeley, CO · listed as North Colorado Medical Center

Colleagues at Banner Hospital Based Physicians Colorado LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 82 clinicians in the practice; 12 are shown here.

• David Corwin Braak, MD Family Medicine Physician · Greeley, CO
• Amber Ciarvella, PA-C Physician Assistant · Greeley, CO
• Mark Dziemianowicz, MD Student in an Organized Health Care Education/Training Program · Greeley, CO
• Dr. Gretchen Evans, MD, MPH Internal Medicine Physician · Greeley, CO
• Christina T Gamboa, MD Student in an Organized Health Care Education/Training Program · Greeley, CO
• Rachel Marie Koch, DO Internal Medicine Physician · Warren, MI
• Esther Liu Mondo, MD Hematology (Internal Medicine) Physician · Loveland, CO
• Amanda Lynn Oeder, PA Physician Assistant · Waukesha, WI
• Dr. Emily Simons, MD Hematology (Internal Medicine) Physician · Loveland, CO
• Jaclyn Heinze Summers, PA-C Physician Assistant · Greeley, CO
• Kaitlin Jane Viola, PA Surgical Physician Assistant · Fort Collins, CO
• Gary Walker, MD, MPH, MS Radiation Oncology Physician · Gilbert, AZ