Dr Shannon E O'mahar, MD - Medicare Hematology/oncology in Madison, WI

Dr Shannon E O'mahar, MD is a medicare enrolled "Internal Medicine - Hematology & Oncology" physician in Madison, Wisconsin. She graduated from medical school in 2005 and has 19 years of diverse experience with area of expertise as Hematology/oncology. She is a member of the group practice Southwest Health Center Inc, Dean Health Systems Inc and her current practice location is 1200 John Q Hammons Dr, Suite 400, Madison, Wisconsin. You can reach out to her office (for appointments etc.) via phone at (608) 410-2700.

Dr Shannon E O'mahar is licensed to practice in Wisconsin (license number 52434-020) and she also participates in the medicare program. She accepts medicare assignments (which means she accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance) and her NPI Number is 1366569899.

Contact Information

Dr Shannon E O'mahar, MD
1200 John Q Hammons Dr, Suite 400,
Madison, WI 53717-1959
(608) 410-2700
(608) 410-2905

Map and Direction




Physician's Profile

Full NameDr Shannon E O'mahar
GenderFemale
SpecialityHematology/oncology
Experience19 Years
Location1200 John Q Hammons Dr, Madison, Wisconsin
Accepts Medicare AssignmentsYes. She accepts the Medicare-approved amount; you will not be billed for any more than the Medicare deductible and coinsurance.
  Medical Education and Training:
  • Dr Shannon E O'mahar graduated from medical school in 2005
  NPI Data:
  • NPI Number: 1366569899
  • Provider Enumeration Date: 03/22/2007
  • Last Update Date: 10/27/2020
  Medicare PECOS Information:
  • PECOS PAC ID: 7517028244
  • Enrollment ID: I20121023000494

Medical Identifiers

Medical identifiers for Dr Shannon E O'mahar such as npi, medicare ID, medicare PIN, medicaid, etc.
IdentifierTypeStateIssuer
1366569899NPI-NPPES
1366569899MedicaidWI

Medical Taxonomies and Licenses

TaxonomyTypeLicense (State)Status
207RH0003XInternal Medicine - Hematology & Oncology 52434-020 (Wisconsin)Primary

Medical Facilities Affiliation

Facility NameLocationFacility Type
Ssm Health St Mary's Hospital - MadisonMadison, WIHospital
Ssm Health St Mary's Hospital - JanesvilleJanesville, WIHospital
Columbus Community HospitalColumbus, WIHospital
Upland Hills HealthDodgeville, WIHospital
Stoughton HospitalStoughton, WIHospital

Group Practice Association

Group Practice NameGroup PECOS PAC IDNo. of Members
Southwest Health Center Inc307242777276
Dean Health Systems Inc70128279831054

Medicare Reassignments

Some practitioners may not bill the customers directly but medicare billing happens through clinics / group practice / hospitals where the provider works. Medicare reassignment of benefits is a mechanism by which practitioners allow third parties to bill and receive payment for medicare services performed by them. Dr Shannon E O'mahar allows following entities to bill medicare on her behalf.
Entity NameDean Health Systems Inc
Entity TypePart B Supplier - Clinic/group Practice
Entity IdentifiersNPI Number: 1053358846
PECOS PAC ID: 7012827983
Enrollment ID: O20031105000584

Medicare Part D Prescriber Enrollment

Any physician or other eligible professional who prescribes Part D drugs must either enroll in the Medicare program or opt out in order to prescribe drugs to their patients with Part D prescription drug benefit plans. Dr Shannon E O'mahar is enrolled with medicare and thus, if eligible, can prescribe medicare part D drugs to patients with medicare part D benefits.

Mailing Address and Practice Location

Mailing AddressPractice Location Address
Dr Shannon E O'mahar, MD
1200 John Q Hammons Dr, Suite 400,
Madison, WI 53717-1959

Ph: (608) 410-2700
Dr Shannon E O'mahar, MD
1200 John Q Hammons Dr, Suite 400,
Madison, WI 53717-1959

Ph: (608) 410-2700

Reviews and Comments


Internal Medicine Doctors in Madison, WI

Prof. Marvin Lyle Birnbaum, MD
Hematology & Oncology
Medicare: Not Enrolled in Medicare
Practice Location: 3330 University Ave, Suite 300, Madison, WI 53705
Phone: 608-263-9641    Fax: 608-265-4429
Dr. Medhavani Dhruv Chandra, MD
Hematology & Oncology
Medicare: Medicare Enrolled
Practice Location: Uw Hospitals & Clinics 600 Highland Ave, Madison, WI 53792
Phone: 608-263-6400    
Yingyu Gao, MD
Hematology & Oncology
Medicare: Medicare Enrolled
Practice Location: 600 Highland Ave, Madison, WI 53792
Phone: 608-263-6400    
Jennifer Marie Rydz, MD
Hematology & Oncology
Medicare: Not Enrolled in Medicare
Practice Location: Uw Health - Gme, 749 University Row Ste 200, Madison, WI 53705
Phone: 608-263-6400    
Dr. Sam Joseph Lubner, MD
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 600 Highland Ave, Madison, WI 53792
Phone: 608-265-1700    
Randy S Heidel, MD
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 20 S Park St, Madison, WI 53715
Phone: 608-287-2250    Fax: 608-287-2438
Benjamin Kleiber, M.D.
Hematology & Oncology
Medicare: Accepting Medicare Assignments
Practice Location: 700 S Park St, Dean & St. Mary's Outpatient Center, Madison, WI 53715
Phone: 608-260-2900    Fax: 608-260-2956

Medicare Program: Medicare is a federal government program which provides health insurance to people who are 65 or older. This program also covers certain younger people with disabilities (who receive Social Security Disability Insurance - SSDI), and people with End-Stage Renal Disease (permanent kidney failure requiring dialysis or a transplant, sometimes called ESRD.

Medicare Assignment: Assignment means that your doctor, provider, or supplier agrees (or is required by law) to accept the Medicare-approved amount as full payment for covered services. Most doctors, providers, and suppliers accept assignment, but you should always check to make sure. Participating providers have signed an agreement to accept assignment for all Medicare-covered services.

NPI Number: The National Provider Identifier (NPI) is a unique identification number for covered health care providers. The NPI must be used in lieu of legacy provider identifiers in the HIPAA standards transactions. Covered health care providers and all health plans and health care clearinghouses must use the NPIs in the administrative and financial transactions adopted under HIPAA (Health Insurance Portability and Accountability Act).

Our Data: Information on www.medicarelist.com is built using data sources published by Centers for Medicare & Medicaid Services (CMS) under Freedom of Information Act (FOIA). The information disclosed on the NPI Registry are FOIA-disclosable and are required to be disclosed under the FOIA and the eFOIA amendments to the FOIA. There is no way to 'opt out' or 'suppress' the NPPES record data for health care providers with active NPIs.