Dr. Theodoros Voloyiannis, MD

Colon & Rectal Surgery  |  
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Dr. Theodoros Voloyiannis, MD
Dr. Voloyiannis has pioneered and teaches nationwide the Single Incision Laparoscopic Colon and Rectal Surgery, which is the most advanced laparoscopic technique for both malignant and benign conditions of the colon and rectum and he has performed more that a thousand of single incision laparoscopic procedures to date. Our clinic offers comprehensive diagnosis and treatment for all conditions and diseases of the colon, rectum and anus, ranging from the most simple to the most complex cases. Our clinic operates in a private practice setting and all surgeries are performed exclusively by Dr. Voloyiannis. The clinic also offers the services of Ashley Wray PA-c MPH, who is closely working with Dr. Voloyiannis in the office, the hospital and the operating room. Ms Wray joined our practice in 2014. Our outcomes range among the best in the nation with the lowest readmission and re-operation rates. The Clear Lake Regional Hospital ranges at the top of the hospitals nationwide for surgical outcomes in our specialty. Dr. Voloyiannis and Ms. Wray's performance ranges at the top 97-99th percentile by Press Ganey for patient satisfaction yearly, with exemplary rates set above 85th percentile.

Texas Oncology Surgical Specialist, Webster

400 W Medical Center Blvd Ste 205

Webster, TX 77598

Contact Information
Dr. Theodoros Voloyiannis, MD

Dr. Theodoros Voloyiannis, MD

Accepted insurance

  • Aetna
  • Amerigroup (Wellpoint)
  • Blue Cross Blue Shield
  • Blue Cross Blue Shield of Texas
  • Cigna
  • Commercial Insurance Company
  • Coventry Health Care
  • First Health (Coventry Health Care)
  • Golden Rule
  • Government Employees Health Association (GEHA)
  • HAP Insurance
  • Humana
  • MHealth Insured
  • MultiPlan
  • 2 More

*Please verify this information when scheduling an appointment.

Learn about Dr. Voloyiannis

Care Philosophy

To provide excellent care in our patients with benign and malignant conditions of the colon rectum and anus.
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Dr. Voloyiannis' Experience

Dr. Voloyiannis' experience matches your search based on the following criteria:
  • Based on total number of patients treated over the last 12 months
  • Specializes in Colon & Rectal Surgery
  • Board certified in Colon & Rectal Surgery and General Surgery
  • No malpractice claims found
  • No sanctions found
  • No board actions found


  • Colon & Rectal Surgery
  • General Surgery

Board Certifications

  • Colon & Rectal Surgery
    Accredited by: American Board of Colon & Rectal Surgery*
  • General Surgery
    Accredited by: American Board of Surgery*

Conditions Treated

  • Abdominal Disorders
  • Abscess
  • Anal Cancer
  • Anal Disorders
  • Anal Fissure
  • Anal Fistula
  • Anal Prolapse
  • Anal and Rectal Cancer
  • Anal or Rectal Pain
  • Anorectal Abscess
  • Cancer
  • Carcinoma in Situ
  • Chlamydia Infections
  • Colitis
  • Colon Disorders
  • Colon Polyp
  • Colonic Volvulus
  • Colorectal Cancer
  • Constipation
  • Crohn's Disease
  • Diseases Contagious from Anal Sex
  • Diseases Contagious from Safe Sex
  • Distal Colorectal Cancer
  • Diverticulitis
  • Endometriosis of Colon
  • Enterocutaneous Fistula
  • Familial Colorectal Cancer
  • Familial Polyposis
  • Fistula
  • Gastrointestinal Diseases
  • Genital Warts
  • Gonorrhea Infections
  • HIV (Human Immunodeficiency Virus)
  • Hamartomatous Colorectal Cancer
  • Hemorrhoids
  • Herpes Simplex Infection
  • Incontinence
  • Inflammatory Bowel Disease
  • Intestinal Abscess
  • Intestinal Diseases
  • Intestinal Fistula
  • Intestinal Ischemia
  • Intestinal Obstruction
  • Intussusception
  • MSI-H Colorectal Cancer
  • MSI-L Colorectal Cancer
  • MSS Colorectal Cancer
  • Metastatic Cancer
  • Neuroendocrine Tumors
  • Paralytic Ileus
  • Pelvic Abscess
  • Perianal Abscess
  • Pericolic Abscess
  • Perirectal Abscess
  • Pilonidal Cyst
  • Pruritus Ani
  • Rectal Cancer
  • Rectal Diseases
  • Rectal Prolapse
  • Rectourethral Fistula
  • Rectovaginal Fistula
  • Retroperitoneal Abscess
  • Secondary Malignancies
  • Sexually Transmitted Diseases (STDs)
  • Sporadic Colorectal Cancer
  • Ulcer
  • Ulcerative Colitis
  • Vaginal Fistula
  • Vesicocolic Fistula
  • Warts


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  • Advanced Laparoscopic Surgery
  • Anal Repair
  • Anoscopy
  • Anoscopy With Removal of Anal Tumor
  • Appendectomy
  • Appendectomy, Laparoscopic
  • Appendectomy, Open
  • Biofeedback
  • Biopsy of Affected Tissue
  • Bowel Resection
  • Colectomy
  • Colon Cancer Screening
  • Colon and Rectal Surgery
  • Colonoscopy
  • Colonoscopy With Polypectomy
  • Colonoscopy, Proctosigmoidoscopy, and Sigmoidoscopy
  • Colorectal Cancer Screening
  • Destruction of Anal Tumor
  • Enterostomy (Laparoscopic or Open)
  • Excision of Rectal Tumor
  • Excisional Biopsy
  • Fistulectomy or Fistulotomy, Anal
  • Flexible Sigmoidoscopy
  • Gastroenterology Procedures
  • Hemicolectomy
  • Hemorrhoidectomy or Excision of Anal Tags
  • Hernia Repair
  • Ileal Pouch-Anal Anastomosis
  • Infrared Coagulation (IRC) Hemorrhoid Removal
  • Intestinal Biopsy
  • Laparoscopic Colectomy
  • Laparoscopic Colon Surgery
  • Laparoscopic Surgical Procedure
  • Minimally Invasive Surgery
  • Non-Surgical Treatment of Hemorrhoids
  • Open Incisional and-or Ventral Hernia Repair
  • Pelvic Fistula Repair
  • Proctectomy, Open or Laparoscopic (incl. Swenson and Duhamel Procedures)
  • Rectal Surgery
  • Removal or Destruction of Rectal or Intestinal Tumor (incl. Colonoscopy, Proctosigmoidoscopy, Sigmoidoscopy and Control of Hemorrhage)
  • Repair of Anal and Rectal Defects (Anoplasty, Repair of Imperforate Anus, Sphincteroplasty, Rectal Graft)
  • Rigid Sigmoidoscopy
  • Screening Colonoscopy
  • Sigmoidoscopy
  • Single Incision Laparoscopic Surgery
  • Sphincterotomy
  • Therapeutic Colonoscopy
  • Ultrasound
  • Ultrasound, Transrectal
  • da Vinci® Colectomy


Read More

Background Check

0 Malpractice Claims

No malpractice history found for Texas.

0 Sanctions

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

0 Board Actions

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


  • Faculty of Medicine of Aristotle University of Thessaloniki
    Undergraduate School | Graduated 1998
  • Faculty of Medicine of Aristotle University of Thessaloniki
    Medical School | Graduated 1998
  • DeBakey Department of Surgery, Baylor College of Medicine
    Internship Hospital | Completed 2001
  • Methodist Hospital,The
    Internship Hospital | Completed 2001
  • DeBakey Department of Surgery, Baylor College of Medicine
    Residency Hospital | Completed 2006
  • Methodist Hospital,The
    Residency Hospital | Completed 2006
  • University of Texas
    Fellowship Hospital | Completed 2007

Awards & Recognition

Awards & Honors
  • Healthgrades Honor Roll
Media & Publications

Dr. Voloyiannis has no media or publications listed.

Languages Spoken

  • English
  • Greek
  • Spanish

Memberships & Professional Affiliations

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

Dr. Voloyiannis' Reviews

Likelihood of recommending Dr. Voloyiannis to family and friends
based on 19 total reviews (3 with comments)
Dr. Voloyiannis' Performance
  • Trustworthiness
  • Explains condition(s) well
  • Answers Questions
  • Time well spent
Office & Staff Performance
  • Scheduling
  • Office environment
  • Staff friendliness
  • Average wait time
    10 to 15 minutes
Patient Comments (3)
in Nederland, TX |
Great surgeon, did a fistula removal and bowel resection. With the surgery done laparoscopy my time in the hospital was 5 days. He listens and cares about his patients. His nurse is also wonderful and very organized. If you need colon or rectal surgery this is the surgeon for the job.
houston, tx |
Doctor Voloylannis and his office staff were very professional and always helpful. Doctor V. will perform my colostomy reversal in a few months and I'm confident I'm in good hands. I will definite recommend to others.
in League City, TX |
This is my second surgery to remove my hemorrhoids. My 1st surgeon is Kelly Gilmore-Lynch and she messed me up BIG time!! It took me almost a year to finally decide to go through the same procedure again. I'm so glad I found Dr. Voloyiannis! I wish I had known him before. I have suffered enough from my previous surgery. Not only did he repaired the other surgeon's mistakes, the recovery from this procedure is a lot less painful. I definitely recommend!!
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See our Colon & Rectal Surgery Specialist at Clear Lake Regional Medical Center

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Now Accepting New Patients
This provider offers the following appointment availability:
Next Day
Dr. Voloyiannis accepts 16 insurance carriers
  • Aetna
    Aetna HMO
    Choice Plus POS II
  • Amerigroup (Wellpoint)
  • Blue Cross Blue Shield
    Blue Card PPO
  • Blue Cross Blue Shield of Texas
    Blue Choice
  • Cigna
    Cigna HMO
    Cigna PPO
    Great West Healthcare-Cigna PPO
    Open Access Plus
  • Commercial Insurance Company
  • Coventry Health Care
  • First Health (Coventry Health Care)
    First Health (Coventry Health Care) PPO
  • Golden Rule
  • Government Employees Health Association (GEHA)
  • HAP Insurance
    Health Alliance
  • Humana
    Choice Care PPO
  • MHealth Insured
  • MultiPlan
    MultiPlan PPO
    PHCS Network PPO
  • Principal Life
  • UnitedHealthCare
    Choice Plus POS
    Navigate HMO
    Navigate POS
    Options PPO

*Please verify this information when scheduling an appointment.

Hospitals where Dr. Voloyiannis has admitting privileges

Memorial Hermann Southeast Hospital
11800 Astoria Blvd
Houston, TX 77089
View Hospital Profile
Memorial Hermann - Texas Medical Center
6411 Fannin St
Houston, TX 77030
View Hospital Profile
Clear Lake Regional Medical Center
500 W Medical Center Blvd
Webster, TX 77598
View Hospital Profile
Pearland Medical Center
11100 Shadow Creek Parkway
Pearland, TX 77584
View Hospital Profile
The Womans Hospital of Texas
7600 Fannin St
Houston, TX 77054
View Hospital Profile