Shannon O'Mahar, MD Hematology and Oncology in Madison, WI

4.9 out of 5 –

SSM Health Cancer Care

1211 Fish Hatchery Road Madison, WI 53715

Dr. O'Mahar is a board certified oncologist. She obtained her undergraduate degree from Stanford University and earned her medical degree from the Washington University School of Medicine in St. Louis. She completed her internship at Barnes-Jewish Hospital in St. Louis and her fellowship at the University of Wisconsin - Madison.

Her area of expertise is the treatment of multiple myeloma, myelodysplastic syndromes, monoclonal gammopathy, melanoma and acute and chronic leukemia.

In her free time, Dr. O'Mahar enjoys baking and writing sort stories and poetry.

About Me

Reviews

Rating Breakdown

Reviews are measured on a scale of 1 to 5, with 5 being the best score.

Question Breakdown
4.9
Overall Experience
4.9
Listened Carefully
4.9
Explained Things Clearly
4.9
Knew Medical History
4.9
Involved in Care Decisions
4.9
Showed Courtesy & Respect

Patient Reviews

SSM Health only displays patient satisfaction data for providers included in our survey process and who have a minimum of 30 returned surveys. The overall rating is an average of all responses to the survey questions listed below. The ratings and comments submitted by patients reflect their own views and opinions. Patient identities are withheld to ensure confidentiality and privacy. Learn more about our survey.

4.9 out of 5

155 ratings,

61 reviews

10/16/2026

I appreciate the amount of time that was spent with me , I know how busy she must have been because of the number of people in the waiting room.

10/16/2026

Dr. O'Mahar is caring and knowlegdeable. She always tries to find the best treatment while not taking too much of a toll on my health.

10/10/2026

Very personable.

10/3/2026

Although my time with Dr. O'mahar has ended through my health journey I will carry her in my heart as another gift from God.

10/2/2026