5
2 Ratings
Summary
Dr. Shannon O'mahar is an oncologist who specializes in treating cancer patients with comprehensive care and expertise. She earned her medical degree from Washington University in St. Louis School of Medicine and brings 21 years of experience to her practice. Dr. O'mahar communicates with patients in English.
Dr. O'mahar is affiliated with SSM Health Saint Mary's Hospital in both Madison and Janesville, as well as Edgerton Hospital and Health Services. She practices at SSM Health Cancer Care locations in Madison and Janesville, Wisconsin. Her expertise includes treating patients with acute and chronic leukemia as well as melanoma. She performs diagnostic procedures such as complete blood counts, white blood cell differentials, and specialized protein testing. Patients consistently rate Dr. O'mahar highly, giving her an average rating of 5.0.
Dr. O'mahar is affiliated with SSM Health Saint Mary's Hospital in both Madison and Janesville, as well as Edgerton Hospital and Health Services. She practices at SSM Health Cancer Care locations in Madison and Janesville, Wisconsin. Her expertise includes treating patients with acute and chronic leukemia as well as melanoma. She performs diagnostic procedures such as complete blood counts, white blood cell differentials, and specialized protein testing. Patients consistently rate Dr. O'mahar highly, giving her an average rating of 5.0.
Overview based on verified provider data
Quick Facts
- accepting new patients
- 21 years of experience
- speaks English
- Washington University In St Louis School Of Medicine
- 2 specialties
- 15 areas of expertise
- 3 board certifications
- 3 hospital affiliations
- 2 office locations
- Female
Office Locations
Shannon E O'mahar has 2 locationsSSM Health Cancer Care
1211 Fish Hatchery RdMadison, WI 53715 Tel: (608) 410-2700
Mon8:00 am - 5:00 pm
Tue8:00 am - 5:00 pm
Wed8:00 am - 5:00 pm
Thu8:00 am - 5:00 pm
Fri8:00 am - 5:00 pm
SatClosed
SunClosed
SSM Health Cancer Care
3200 E Racine StJanesville, WI 53546 Tel: (608) 410-2700
Mon8:00 am - 5:00 pm
Tue8:00 am - 5:00 pm
Wed8:00 am - 5:00 pm
Thu8:00 am - 5:00 pm
Fri8:00 am - 5:00 pm
SatClosed
SunClosed
Compare with Similar Doctors
 |  |  |  |
| Shannon E O'mahar, MD | Dr. Anne Marie Traynor, MD | Dr. Sima Ehsani Chimeh | Dr. Thomas Ira Sweet, MD |
| Oncology | Oncology | Internal Medicine | Oncology |
| Accepts New Patients | Accepts New Patients | Accepts New Patients | |
| 21 Years of Experience | 36 Years of Experience | 31 Years of Experience | 42 Years of Experience |
| No Virtual Visit Option | No Virtual Visit Option | No Virtual Visit Option | No Virtual Visit Option |
| Speaks English | Speaks English | Speaks English | Speaks Spanish, English |
| Madison , WI | Madison , WI | Tucson , AZ | Madison , WI |
| Med School: Washington University In St Louis School Of Medicine | Med School: University Of North Carolina At Chapel Hill School Of Medicine | Med School: Tehran University Of Medi | Med School: University Of Minnesota Medical School |
Current Profile | View Profile | View Profile | View Profile |
Insurance Plans Accepted by Shannon E O'mahar
Be sure to verify insurance information directly with your doctor's office, as it may undergo frequent changes.
Medical Specialties
Shannon E O'mahar has the following 2 specialties
Specialty Expertise
Shannon E O'mahar has the following 15 areas of expertise
Certifications, License, & Education
21 Years Experience
Shannon E O'mahar holds an expired medical license in the state of Wisconsin.
Medical License
Medical Doctor with an expired medical license in the state of Wisconsin that expired in 2025.
Education & Training
Medical School
Graduated from Washington University In St Louis School Of Medicine in 2005.
NPI Number
Shannon E O'mahar's NPI number is 1366569899.
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Frequently Asked Questions
- Is Shannon O'mahar accepting new patients?
- Shannon O'mahar is accepting new patients on Vitals. View Shannon O'mahar's profile on Vitals to make an appointment.
- Does Shannon O'mahar accept my insurance?
- You can see the insurance plans that Shannon O'mahar accepts on their Vitals profile.
- Which hospitals is Shannon O'mahar affiliated with?
- Shannon O'mahar is affiliated with Ssm Health Saint Marys Hospital Madison, Edgerton Hospital And Health Services, and Ssm Health Saint Marys Hospital Janesville.
- What languages does Shannon O'mahar speak?
- Shannon O'mahar speaks English.
- Where is Shannon O'mahar's office located?
- Shannon O'mahar's office is located at 1211 Fish Hatchery Rd, Madison, WI, 53715.
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