Dr. Shannon O'Mahar, MD

• n/a

  Malpractice Claims not available

  Healthgrades does not collect malpractice information for Wisconsin.

  What is medical malpractice

  What is medical malpractice?

  Medical malpractice is issued when negligence by a doctor causes injury to a patient. For example, a doctor may improperly diagnose, treat or medicate outside the standard of medical care. The three types of malpractice are: a settlement, an arbitration award, or a judgment.

  If my doctor has malpractice history, does that mean he or she is a poor-quality doctor?

  If your doctor has a malpractice claim, evaluate the information and determine if the action could potentially impact the quality of care you receive. Claim settlements and arbitration awards may occur for a variety of reasons, which should not necessarily reflect negatively on the doctor's professional competence or conduct.
  You may want to use this information to start a discussion with the doctor about his or her history and specific ability to provide healthcare for you.

  How far back does Healthgrades malpractice history go?

  Healthgrades reports details of a doctor’s malpractice history when the doctor has at least one closed medical malpractice claim within the last five years, even if he or she no longer practices in that state.

  For which states does Healthgrades collect malpractice history?

  Healthgrades collects malpractice information from California, Colorado, Connecticut, Florida, Georgia, Illinois, Massachusetts, Nevada, New Jersey, New York, North Carolina, Oregon, Tennessee, Texas, Vermont, Virginia and West Virginia. If your doctor has a malpractice claim, evaluate the information and determine if the action could potentially impact your quality of care. Sometimes multiple states report the same claim. If a provider practices in a state where data is unavailable, please reach out to your local state legislature to help make this data publicly available.
• 0

  Sanctions

  No sanctions history found for the years that Healthgrades collects data.

  What is a sanction or disciplinary action

  What is a sanction or disciplinary action?

  A sanction, also known as a disciplinary action, is an action taken to punish or restrict a doctor who has demonstrated professional misconduct. Sanctions may be imposed by a state medical board, professional medical licensing organization, or the U.S. Department of Health and Human Services.

  If my doctor has sanction history, does that mean he or she is a poor-quality doctor?

  If a doctor has a sanction, it does not necessarily mean that he or she is a poor-quality doctor. Some sanctions are not related to medical care, and involve a doctor’s finances or administrative activities. Before you make any choices about changing your doctor, we recommend that you evaluate the doctor’s sanction information and determine how severe or relevant you think the sanction cause and action were.

  How far back does Healthgrades sanction history go?

  Healthgrades reports state and federal sanctions from the previous five years, except when a doctor's license has been revoked or surrendered. Healthgrades displays all actions for doctors whose licenses have been revoked or surrendered.

  For which states does Healthgrades collect sanction history?

  Healthgrades collects sanction history from all 50 U.S. states. Physicians with a disciplinary action in one state may move to another state where they have a clean record. Since Healthgrades painstakingly compiles disciplinary action information from all 50 states, Healthgrades website will show if a physician has a disciplinary action in more than one state.
• 0

  Board Actions

  No board actions found for the years that Healthgrades collects data.

  What are board actions

  What are board actions?

  Board actions are non-disciplinary actions imposed upon a doctor based on a complaint investigation. A patient or medical colleague may file a complaint with that state medical board or professional licensing organization, which then investigates the complaint. Board actions are intended to ensure that a doctor is able to perform safe medical and health care tasks.

  Types of non-disciplinary actions include an advisory letter, a corrective action agreement, a limitation or restriction on the medical or healthcare tasks a doctor can perform, or a voluntary agreement by the doctor not to practice. A board action can also include a termination of a corrective action agreement or voluntary agreement, which allows the doctor to return to full practice.

  If my doctor has a board action, does that mean he or she is a poor-quality doctor?

  If a doctor has a board action, it means he or she has had a non-disciplinary action imposed upon him or her. It does not necessarily mean that he or she is a poor quality doctor. Before you make any choices about changing your doctor, evaluate the doctor's board action information and determine how severe or relevant you think the cause and action were.

  How far back does Healthgrades non-disciplinary board action history go?

  Healthgrades reports non-disciplinary board action history from for the previous five years, except when a doctor's license has been revoked or surrendered. Healthgrades displays all actions for doctors whose licenses have been revoked or surrendered.

  For which states does Healthgrades collect non-disciplinary board actions?

  Healthgrades collects non-disciplinary board actions from all 50 U.S. states.

• Hematology
• Internal Medicine
• Medical Oncology

• Acute Leukemia
• Acute Myeloid Leukemia
• All Lymphoma
• Anal and Rectal Cancer
• Anemia
• Bleeding Disorders
• Blood Disorders
• Bone Cancer
• Bone Disorders
• Brain Cancer
• Brain and Nervous System Cancer (incl. Gliomas, Astrocytoma, Schwannoma, Medulloblastoma, Chordoma)
• Breast Cancer
• Cancer
• Carcinoma in Situ
• Cervical Cancer
• Chronic Myeloid Leukemia (CML)
• Colorectal Cancer
• Deep Vein Thrombosis (DVT)
• ENT Cancer
• Esophageal Cancer
• Gynecologic Cancer
• Head and Neck Cancer
• Hodgkin's Disease
• Immune Thrombocytopenic Purpura (ITP)
• Kidney Cancer
• Leukocytosis
• Liver Cancer
• Lung Cancer
• Lymphocytosis
• Lymphoma
• Lymphoma, Large-Cell
• Macroglobulinemia (incl. Waldenstrom's )
• Mantle Cell Lymphoma
• Marginal Zone Lymphoma
• Melanoma
• Myelodysplastic Syndromes
• Myeloma
• Myeloproliferative Disorders
• Neutropenia
• Nodular Lymphoma
• Non-Hodgkin's Lymphoma
• Oral Cancer
• Ovarian Cancer
• Pancytopenia
• Polycythemia Rubra Vera
• Prostate Cancer
• Purpura
• Secondary Malignancies
• Skin Cancer
• Small Intestine Cancer
• Soft Tissue Sarcoma
• Squamous Cell Carcinoma
• Stomach and Small Intestine Cancer
• Testicular Cancer
• Throat Cancer (Hypopharyngeal)
• Throat Cancer (Oropharyngeal)
• Thrombocytosis
• Thrombosis
• Uterine Cancer
• Uterine Diseases

• Medical School

  Washington Univ Sch Of Med

  Graduated in 2005

• Internship Hospital

  Barnes-Jewish Hospital

• Residency Hospital

  Barnes-Jewish Hospital

  Completed in 2008

• Fellowship Hospital

  University Of Wisconsin Hospital and Clinics

  Completed in 2012

• Undergraduate School

  Stanford U

  Graduated in 2000

• English

Dr. O'Mahar does not have any memberships or affiliations listed. If you are Dr. O'Mahar and would like to add memberships or affiliations, please update your free profile.

• Medical Oncology
• Hematology
• Internal Medicine

• Bone Marrow Biopsy