Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
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Dr. Shannon E O'Mahar, MD

Individual provider Hematology & Oncology Physician · NPI 1366569899

Dr. Shannon E O'Mahar, MD is a Hematology/Oncology in Madison, Wisconsin. Qualified in 2005, 21 years ago. Practices with Dean Health Systems Inc, a 1,184-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Wisconsin.

Years since qualifying
21
Licensed in
WI
In the registry since
2007
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

1200 John Q Hammons Dr Ste 400
Madison, WI 53717-1959
Phone: (608) 410-2700
Fax: (608) 410-2905
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Hematology & Oncology Physician (primary) Taxonomy 207RH0003X · Licence 52434-020 (WI)

Record details

NPI number1366569899
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 22, 2007
Last updated in NPPESOctober 27, 2020
Certification dateOctober 27, 2020
Mailing address1200 John Q Hammons Dr, Suite 400, Madison, WI 53717-1959

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyHEMATOLOGY/ONCOLOGY
Medical schoolOTHER
Graduated 2005 (21 years in practice)
Group practice Dean Health Systems Inc — 1184 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

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