Walter Koltun, MD, Colon & Rectal Surgery, Hershey, PA, Penn State Milton S. Hershey Medical Center


Colon & Rectal SurgeryHershey, PA

Chief of Colorectal Surgery

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Education & Training

  • Lahey ClinicFellowship
  • Brigham and Women's Hospital
    Brigham and Women's HospitalResidency
  • Harvard Medical School
    Harvard Medical SchoolMedicalSchool
  • Massachusetts Institute of TechnologyOtherTraining

Certifications & Licensure

  • PA State Medical License
    PA State Medical License 1990 - 2020
  • American Board of Colon and Rectal Surgery Colon & Rectal Surgery
  • American Board of Surgery Surgery
  • American Board of Colon and Rectal Surgerycolon and rectal surgery

Awards, Honors, & Recognition

  • Regional Top Doctor Castle Connolly, 2014
  • Castle-Connelly Top Doctor 2011
  • Outstanding Mentor Penn State College of Medicine Class of 2008, 2008
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Clinical Trials

Publications & Presentations


Journal Articles

  • Genetic Determinants Associated with Early Age of Diagnosis of IBD  
    Connelly TM, Berg AS, Harris L, Brinton D, Deiling S, and Koltun WA, Diseases of the Colon and Rectum, 1/1/2015
  • The Cancer "Fear" in IBD Patients: Is It Still Real?  
    Connelly TM and Koltun WA, J Gastrointest Surg, 1/1/2014
  • The TNFSF15 Gene Single Nucleotide Polymorphism rs7848647 is Associated with Surgical Diverticulitis  
    Connelly TM, Berg A, Hegarty JP, Harris L, Brinton D, Deiling S, Poritz LS, and Koltun WA, Ann Surg, 1/1/2014
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Books/Book Chapters

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  • Is There An Asian Ethnic Disparity in Outcomes Following Colectomy for Diverticulitis?
    Choi CS, Koltun WA, Hollenbeak CS, Pennsylvania Society of Colon and Rectal Surgeons, Philadelphia, PA, 1/13/2015
  • Surgical Diverticulitis is Not Associated with Defects in Expression of Wound Healing Genes
    Connelly TM, Berg AS, Harris L, Brinton D, Deiling S, Koltun WA, American Society of Colon and Rectal Surgeons, Hollywood, FL, 1/17/2014
  • A Single Nucleotide Polymorphism in the I14 Gene is Strongly Associated with Susceptibility to Clostridium Difficile Infection in Inflammatory Bowel Disease Patient
    Connelly TM, Koltun WA, Berg AS, Hegarty JP, Harris L, Deiling S, and Stewart DB, Central Surgical Association, Indianapolis, IN, 1/7/2014
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  • The Evolving Role of Genetics in the Surgical Management of IBD 
    Carlisle Regional Medical Center, Carlisle, PA - 1/21/2014
  • Surgery Still Better Than Remicade for IBD 
    Cleveland Clinic Florida, Weston, FL - 1/10/2014
  • Is Diverticulitis a Genetic Disease? 
    Barcelona, Spain - 1/25/2014
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Press Mentions

  • Walter Koltun, MD, on the Role of Diet in Ileal Pouch–Anal Anastomosis
  • Walter Koltun, MD, on Patient Outcomes of Ileal Pouch–Anal Anastomosis
  • Early Colon Cancer Screening Advised for SomeMarch 12, 2018
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Professional Memberships

Hospital Affiliations