Nicholas J. Ahn, MD — Academic Profile

Nicholas Ahn, MD

Assistant Professor of Surgery

Associate Program Director for Colon and Rectal Surgery Residency

Board Certification

General Surgery

Colorectal Surgery


Medical School
Pennsylvania State University College of Medicine, Hershey, PA (2013)

Residency Training
Albany Medical Center, Albany, NY 

Fellowship Training
Colon and Rectal Surgery, Stony Brook University Medical Center, Stony Brook, NY

Research Fellow in Stem Cells and Fetal Research, Children's Hospital of Philadelphia, Philadelphia, PA

Affiliated Specialty Center

Cancer Center
Inflammatory Bowel Disease Center

Clinical Interests/Expertise

  • Robotic, laparoscopic, and conventional surgery for colon and rectal cancer, familial polyposis, diverticulitis, and rectal prolapse
  • High resolution anoscopy for anal cancer screening and prevention
  • Inflammatory bowel disease, Crohn's disease, and ulcerative colitis
  • Robotic and minimally invasive transanal excision of rectal polyps or cancer
  • Treatment of anorectal abscess, fistula, fissure, anal condyloma, hemorrhoids, constipation, and fecal incontinence
  • Screening and diagnostic colonoscopy

Contact Information

Division of Colon and Rectal Surgery
Department of Surgery, Health Sciences Center T18-046B
Stony Brook Medicine
Stony Brook, NY 11794-8191
Tel: 631-444-1825
Fax: 631-444-7784

For patient care information, including insurance participation and practice locations, click here.

Awards and Honors

Outstanding Faculty Teaching Scholar, Stony Brook University Hospital, NY. 2023

Teacher of the Year Award, Stony Brook University Hospital, NY. 2022

Resident Research Presentation Award, 3rd Place. Annual General Surgery Resident Research Day. Albany, NY. 2018

Umberto Nicolini Award. International Fetal Medicine and Surgery Society (IFMSS) - 36th Annual Meeting. Jackson Hole, WY. 2017

Finkelstein Memorial Student Research Award. Penn State College of Medicine. Hershey, PA. 2010


  • Kim, W., Ahn, N.J., Ata, A., Adamo, M.A., Entezami, P., Edwards, M. Pediatric Cervical Injury in the United States: Defining the Burden of Injury, Need for Operative Intervention, and Disparities in Imaging Across Trauma Centers. J Pediatr Surg. 2020 May 11;S0022-3468(20)30321-3.
  • Riley, J.S., McClain, L.E., Stratigis, J.D., Coons, B.E., Ahn, N.J., Li, H., Loukogeorgakis, S.P., Fachin, C.G., Dias, A.I.B.S., Flake, A.W., Peranteau, W.H. Regulatory T cells promote alloengraftment in a model of late-gestation in utero hematopoietic cell transplantation. Blood Adv. 2020 Mar 24;4(6):1102-1114.
  • Loukogeorgakis, S.P., Fachin, C.G., Dias, A.I.B.S., Li, H., Tang, L., Kim, A.G., Vrecenak, J.D., Stratigis, J.D., Ahn, N.J., Nissim, I.,Nissim, I., Moron, A.F., Martins, J.L., Peranteau, W.H., De Coppi, P., Irvine, D., Flake, A.W. Donor cell engineering with GSK3 inhibitor-loaded nanoparticles enhances engraftment after in utero transplantation. Blood. 2019 Nov 28;134(22):1983-1995.
  • Oda, M.H., dos Santos, D.V., Farias, A.K., de Oliveira, L., Falcao, B.P., Ahn, N.J., Amarante, A.C., Losso, G.M., Dias, A.I.B.S., Agulham, M.A., Fachin, C.G. Bladder urothelial carcinoma in a child: a case report and review of literature. Front Pediatr. 2019 Sep 20;7:385.
  • Loukogeorgakis, S.P., Shangaris, P., Bertin, E., Franzin, C, Piccoli M, Pozzobon M, Subramaniam S, Tedeschi A, Kim AG, Li H, Fachin CG, Dias AIBS, Stratigis JD, Ahn NJ, Thrasher AJ, Bonfanti P, Peranteau WH, David A, Flake AW, De Coppi P. In Utero Transplantation of Expanded Autologous Amniotic Fluid Stem Cells Results in Long-Term Hematopoietic Engraftment. Stem Cells. 2019 Sep;37(9):1176-1188.
  • Alapati, D., Zacharias, W.J., Hartman, H.A., Rossidis, A.C., Stratigis, J.D., Ahn, N.J., Coons, B., Zhou, S., Li, H., Singh, K., Katzen, J., Chadwick, A.C., Musunuru, K., Beers, M.F., Morrisey, E.E., Peranteau, W.H. In utero gene editing for monogenic lung disease. Sci Transl Med. 2019 Apr 17;11(488):eaav8375.
  • Van Backer, J.*, Ahn, N.J.*, Chan, R., Canete, J., Chismark, D., Valerian, B.T., Lee, E.C. *co-first author. Early Urinary Catheter Removal in Patients Undergoing Colorectal Surgery with an Enhanced Recovery after Surgery Pathway. Am Surg. 2019 Mar 1;85(3):e139-e141.
  • Ahn N.J., Peranteau W.H. (2019). Sacrococcygeal Teratoma. In K.C. Chung, A.K. Gosain (Ed.) Operative Techniques in Pediatric Plastic and Reconstructive Surgery First edition (Ch. 63 pp. 423-427). Philadelphia: LWW.
  • Rossidis, A.C., Stratigis, J.D., Chadwick, A.C., Hartman, H.A., Ahn, N.J., Li, H., Singh, K., Coons, B.E., Li, L., Lv, W., Zoltick, P.W., Alapati, D., Zacharias, W., Jain, R., Morrisey, E.E., Musunuru K, Peranteau W. In utero CRISPR-mediated therapeutic editing of metabolic genes. Nat Med. 2018 Oct;24(10):1513-1518.
  • Ahn, N.J.*, Stratigis, J.D.*, Coons, B.E., Flake, A.W., Nah-Cederquist, H.D., Peranteau, W.H. *co-first author. Intravenous and Intra-amniotic In Utero Transplantation in the Murine Model. J Vis Exp. 2018 Oct 9;(140):58047.
  • Ahn, N., Signor, G., Singh, T.P., Stain, S., & Whyte, C. Robotic Single- and Multisite Cholecystectomy in Children. J Laparoendosc Adv Surg Tech A. 2015 Dec;25(12):1033-5.


Advanced Cardiac Life Support
Advanced Trauma Life Support
Basic Life Support
Functional laparoscopic skills

Professional Societies:

American College of Surgeons
American Society of Colon and Rectal Surgeons
New York Society of Colorectal Surgeons