Christopher Sonnenday, 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.

• University Of Michigan Health System Hospital · Ann Arbor, MI

Colleagues at Regents of the University of Michigan

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 3271 clinicians in the practice; 12 are shown here.

• Rouba Ali Fehmi, MD Anatomic Pathology Physician · Ann Arbor, MI
• Dr. James Brian Byrd, MD Internal Medicine Physician · Ann Arbor, MI
• Michelle Sugiyama Caird, MD Orthopaedic Surgery Physician · Ann Arbor, MI
• Dr. Kristine Hoel Golmirzaie, MD Anesthesiology Physician · Ann Arbor, MI
• Mohannad Ibrahim, MD Neuroradiology Physician · Ann Arbor, MI
• Jennifer Reilly Lukela, MD Internal Medicine Physician · Ann Arbor, MI
• Michael Mazza, MD Diagnostic Radiology Physician · Ann Arbor, MI
• Amy Elizabeth Rothberg, MD Internal Medicine Physician · Ann Arbor, MI
• Michael James Shea, MD Internal Medicine Physician · Ann Arbor, MI
• Jennifer A Stowitts, CRNA Certified Registered Nurse Anesthetist · Ann Arbor, MI
• Balazs Szamosfalvi, MD Nephrology Physician · Ann Arbor, MI
• Pamela Erskine Williams, MD Ophthalmology Physician · Ann Arbor, MI

Other providers in Ann Arbor

• Nikhil Shah, MD

  Individual Surgery Physician · NPI 1538726575

  1500 E Medical Center Dr Cw Mott 4964 Spc 4211, Ann Arbor, MI 48109-5000 · (734) 232-8560

• Jenny Meng Shao Kashmanian, MD

  Individual Surgery Physician · NPI 1760800502

  2926A Taubman Center 1500 E Medical Center Dr, Ann Arbor, MI 48109-5331 · (734) 936-5792

• Kyle Hershey Sheetz, MD

  Individual Surgery Physician · NPI 1407269004

  1500 E Medical Center Dr, Ann Arbor, MI 48109-5000 · (734) 936-4000

• Alison Kay Snyder-Warwick, MD

  Individual Surgery Physician · NPI 1528189743

  24 Frank Lloyd Wright Dr, Ann Arbor, MI 48105-9484 · (734) 998-6022

• Vikram Sood, MD

  Individual Surgery Physician · NPI 1487090320

  1500 E Medical Center Dr, Ann Arbor, MI 48109-5000 · (734) 936-4000

• Karen Elizabeth Speck, MD

  Individual Surgery Physician · NPI 1962621169

  1500 E Medical Center Dr, Ann Arbor, MI 48109-5000 · (734) 936-4000

• James Charles Stanley, MD

  Individual Surgery Physician · NPI 1598866501

  1500 E Medical Center Dr 3rd Fl Cardiovascular Center Recp B, Ann Arbor, MI 48109-5329 · (734) 936-5850

• Randall S Sung, MD

  Individual Surgery Physician · NPI 1689765257

  1500 E Medical Center Dr, Ann Arbor, MI 48109-5000 · (734) 936-4000