
Due to a contract dispute between UnitedHealthcare and Ascension Wisconsin, we understand many of our patients have questions and concerns. We want to reassure you and provide clarity regarding your care.
We are still in-network with UnitedHealthcare, and that contract remains in effect until October 1, 2025. Please note that even if you receive a letter from UnitedHealthcare stating otherwise, you are still covered for your appointments with us.
If you have an upcoming appointment, please do not cancel it at this time. We are closely monitoring the negotiations and will provide updates as soon as they become available. Our goal is to ensure you continue to receive the care you need with as little disruption as possible.
For more information, you can visit the official negotiation pages for each organization:
We appreciate your patience and will keep you informed of any changes.
Dr. Rachel Oosterbaan attended medical school at Wayne State University in Detroit, and she completed her residency in Internal Medicine at Harvard Medical School during her postdoctoral training. In addition to serving as an attending physician at Northwestern Medicine® Lake Forest Hospital in Lake Forest, Illinois and at Northwestern Memorial Hospital in downtown Chicago over the past 16 years, Dr. Oosterbaan also worked as an assistant professor at Northwestern University’s Feinberg School of Medicine since 2000. Dr. Oosterbaan is board certified in Internal Medicine. Her most recent achievements include being voted by Castle Connolly as a “Top Doctor” in the Chicago metropolitan area, as well as voted by US News Report as a “Best Doctor.”
13133 N. Port Washington Road
Suite G18
Mequon, WI 53097
Appointments: (262)-243-5000
Get started on the road to healing by scheduling an appointment with our Rachel Oosterbaan, M.D. Call for an appointment or complete our contact form.
Seton Professional Building (262) 243-5000