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Bartlomiej (Bart) Posnik, M.D.

Bartlomiej (Bart) Posnik, M.D. Photo

Provider Type: Physician

Board Certifications:
  • Hematology
  • Internal Medicine
  • Medical Oncology
Spoken Languages: English, Polish, Spanish



  • Residency in Internal Medicine
    West Suburban Medical Center, Oak Park, IL
  • Fellowship in Hematology/Medical Oncology
    John H. Stroger Jr. Hospital of Cook County, Chicago, IL
  • Medical Doctorate
    Poznan University of Medical Sciences, Poznan, Poland
  • Bachelor of Arts
    Saint Louis University, St. Louis, MO

Accolades & Memberships

  • American College of Physicians
  • American College of Physicians, Governor’s Outstanding Resident of the Year Award (2016)
  • American Society of Clinical Oncology
  • American Society of Hematology
  • John H. Stroger, Jr. Hospital, Chief Oncological Fellow (2019 – 2020)
  • West Suburban Medical Center, Lead Senior Medical Resident, Oak Park, IL (2016 – 2017)
  • West Suburban Medical Center, Resident of the Year, Oak Park, IL (2016 – 2017)


  • Interest and Use of Alternative/Holistic Therapies Amongst Cancer Patients at a Large Urban Safety-Net Hospital (Abstract Supplement)

    American Society of Clinical Oncology, 2019

  • A Rare Case of Syndrome of Inappropriate Antidiuretic Hormone and Tumor Lysis in Ovarian Cancer

    American Journal of Hematology & Oncology, 2016

  • Renal Failure Due to Direct Infiltration of Chronic Lymphocytic Leukemia: Case Report and Review of Treatment

    American Journal of Cancer Case Reports, 2016

  • Pulmonary Inflammation After Ethanol and Burn Injury Is Attenuated in the Absence of IL-6

    Alcohol - An International Biomedical Journal, 2013

  • Acute Progression of Adult-onset Atypical Hemolytic Uremic Syndrome due to CFH Mutation: A Case Report

    Case Reports in Nephrology, 2013

Show all Publications
  • Clinical Predictors of Pancreatic Malignancy in Patients >50 Years of Age With Non-Alcoholic/ Non-Gallstone Related Acute Pancreatitis

    Gastrointestinal Endoscopy, 2010

Other Information

Dr. Posnik grew up in Chicago and currently lives in Austin with his wife Courtney and their two children. Dr Posnik and his family enjoy spending time outside, traveling, cooking together, and walks with their rescue dog, Twiggy. In 2019, Dr. Posnik completed the Louisville Ironman Triathlon in 11.5 hours, and his other interests include physical fitness, healthy living, outdoor recreation, and cars. He completed his hematology and oncology training at the famous Cook County Hospital in downtown Chicago, where he served as Chief Oncology Fellow in his final year. Dr Posnik is committed to providing leading edge cancer care with compassion and a holistic, patient-centered approach.