Summary

Dr. Shannon O'mahar treats acute and chronic leukemia and melanoma. She has practiced oncology for 21 years and is affiliated with SSM Health Saint Marys Hospital Madison, Edgerton Hospital and Health Services, and SSM Health Saint Marys Hospital Janesville.

She earned her medical degree from Washington University in St. Louis School of Medicine and sees patients in Madison and Janesville, Wisconsin. Patients on Vitals rate Dr. O'mahar 5 out of 5.

Overview based on verified provider data

Quick Facts

  • accepting new patients
  • 5
  • 21 years of experience
  • speaks English
  • Washington University In St Louis School Of Medicine
  • 2 specialties
  • 15 areas of expertise
  • 3 hospital affiliations
  • 2 office locations
  • Female

Office Locations

Shannon E O'mahar has 2 locations

SSM Health Cancer Care

1211 Fish Hatchery RdMadison, WI 53715
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
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. Samuel Lawrence Rotter
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Shannon E O'mahar, MDDr. Samuel Lawrence RotterDr. Matthew FolstadDr. Gabrielle E Waclawik
OncologyInternal MedicineOncologyOncology
Accepts New Patients
5 
0 
0 
0 
21 Years of Experience 10 Years of Experience 7 Years of Experience
No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option No Virtual Visit Option
Speaks English
Madison , WIMadison , WIMadison , WIMadison , WI
Med School: Washington University In St Louis School Of Medicine Med School: Medical College Of Wisconsin Med School: University Of Wisconsin School Of Medicine & Public Health
Current Profile
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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

  • Blood Cancer
  • Bone Marrow Transplant
  • Breast Cancer
  • Chemotherapy
  • Chronic Myeloid Leukemia
  • Chronic Myelomonocytic Leukemia
  • Colorectal Cancer
  • Deep Vein Thrombosis
  • Hepatitis C
  • Leukemia
  • Lymphoma
  • Metastatic Breast Cancer
  • Myelofibrosis
  • Myeloma
  • Oncologist/hematologist

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

Does Shannon O'mahar accept virtual/telehealth appointments?
Shannon O'mahar has not indicated that they accept virtual/teleheatlh appointments. Contact their office through their Vitals profile to check for availability.
Where is Shannon O'mahar's office located?
Shannon O'mahar's office is located at 1211 Fish Hatchery Rd, Madison, WI, 53715.
What languages does Shannon O'mahar speak?
Shannon O'mahar speaks English.
Does Shannon O'mahar accept my insurance?
You can see the insurance plans that Shannon O'mahar accepts on their Vitals profile.
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.

Data Sources

This provider profile is built using data from:

  • NPPES NPI Registry
  • State medical licensing boards
  • Healthcare system and provider network data

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