Theodoros Voloyiannis, M.D., FACS, FASCRS
Theodoros Voloyiannis, M.D., FACS, FASCRS, is a colon and rectal surgeon in the Houston area and serves as the chairman of colon and rectal surgery for The US Oncology Network.

Provider Type



Colon and Rectal Surgery

Board Certifications

Colon and Rectal Surgery

General Surgery


Texas Colon & Rectal Specialists–Webster
400 W. Medical Center Blvd., Suite 205
Webster, TX 77598
Phone: 832-932-1720
Fax: 281-885-4937

Spoken Languages



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  • Fellowship in Colon and Rectal Surgery
    The University of Texas Health Science Center at Houston
    Houston, TX
  • Residency in General Surgery
    Baylor College of Medicine
    Houston, TX
  • Internship in General Surgery
    Baylor College of Medicine
    Houston, TX
  • Medical Doctorate
    Aristotle University of Thessaloniki
    Thessaloniki, Greece

Accolades & Memberships

  • American College of Surgeons
  • American Society of Colon and Rectal Surgeons
  • Harris County Medical Society
  • Houston Surgical Society Member
  • Texas Medical Association

Primary Hospital Affiliations and Surgical Facilities

  • Bay Area Surgicare Center
  • Fannin Surgicare
  • HCA Houston Healthcare Clear Lake
  • HCA Houston Healthcare Pearland
  • HCA Houston Healthcare Southeast
  • The Woman's Hospital of Texas


  • Hemicolectomy: Single Incision Laparoscopic Technique
    Operative Techniques in Surgery, 2015. Volume Two. Chapter 12. p. 1009, 2015
  • Restorative Proctocolectomy: Single Incision Laparoscopic Technique (Including Pouch Ileoanal Anastomosis)
    Operative Techniques in Surgery, 2015. Volume Two. Chapter 37. p. 1239, 2015
  • Management of the Difficult Colon Polyp Referred for Resection: Resect or Rescope?
    Diseases of the Colon & Rectum, 2008
  • MRSA-Related Perianal Abscesses: An Underrecognized Disease Entity
    Diseases of the Colon & Rectum, 2007
  • Neonatal Hemochromatosis: Radiographical and Histological Signs
    Liver Transplantation, 2005
  • Aortic Graft Pseudo-Pseudoaneurysms
    Vascular Medicine, 2005
  • Delayed Neurologic Deficit After Endovascular Abdominal Aortic Aneurysm Repair
    Journal of Vascular Surgery, 2003

Conditions (variable)

  • Anal Fistula – Fissure
  • Colon Cancer
  • Crohn’s disease
  • Diverticulitis
  • Fecal incontinence
  • Hemorrhoids
  • HPV – Anal dysplasia
  • Rectal Cancer
  • Rectal prolapse
  • Screening for colorectal / anal cancer

Procedures (variable)

  • Anorectal surgery
  • Colonoscopy
  • Minor office procedures
  • Neurostimulator for fecal incontinence
  • Pelvic floor retraining / anorectal manometry and ultrasound
  • Robotic single incision laparoscopic surgery

Other Information

Dr. Voloyiannis speaks fluent English and Greek, and office staff speak fluent English and Spanish. 


Existing patients please access the patient portal login to request an appointment.