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Casillas, Sergio Rafael, MD

Chief, General Surgery, Backus Hospital





Providing the best care to our patients and their companions requires communicating in a way everyone understands. Interpreter services are available 24 hours a day, 7 days a week, 365 days a year. All spoken languages are available, as well as American Sign Language (AS/L).

Accepting New Patients
  • General Surgery
  • Colon & Rectal Surgery

Areas of Expertise
Abdominal Wall Hernias, Anal Cancer, Anal Fissures, Anal Fistulas, Appendectomy, Cancer of the Small Intestine, Cholecystectomy, Colon Cancer, Colonoscopy, Colorectal Cancer Screening, Colorectal Surgery, Crohn's Disease, da Vinci Robotic Surgery, Diverticular Disease, Fecal Incontinence, Flexible Sigmoidoscopy, Gallbladder Surgery, Gastroenterology / Digestive Diseases in Women, Gastrointestinal Cancer, Gastrointestinal Surgery, Groin Hernias, Hemorrhoids, Hernia Repair, Hernia Surgery, Ileoanal Pouch Surgery, Inflammatory Bowel Disease (IBD), Intestinal Surgery, Laparoscopic Colon Surgery, Laparoscopic Gallbladder Surgery, Laparoscopic Hernia Repair, Laparoscopic Surgery, Minimally Invasive Colon Surgery, Minimally Invasive Hernia Repair, Minimally Invasive Surgery, Pilonidal Surgery, Pouchoscopy, Rectal Cancer, Rectal Prolapse, Robotic Colon Surgery, Robotic Hernia Repair, Robotic Surgery, Sacral Nerve Stimulation, Sphincter Sparing Surgery, Ulcerative Colitis


The Cleveland Clinic

SUNY Upstate Medical University at Syracuse

Medical School
LaSalle University

SUNY Upstate Medical University at Syracuse


Verified Patient Reviews

5 out of 5 stars

The compassion and care I received was so important to me as I begin this new journey. I was made to feel as if I've known *Dr. Casillas my whole life. He is the example all drs. should follow.

5 out of 5 stars

*Dr. Casillas was very thorough in his care and treatment of my issues.

5 out of 5 stars

*Dr. Casillas is amazing. This is the second time I've had to see him (first time was a related issue), and he could not have been any better. My hope is that he continues to practice for a very longtime, as he is just the best!

5 out of 5 stars

I can only say that this office is outstanding!

Other Reviews from Around the Web

5 out of 5 stars

Dr.Casillas is very compassionate. He listens and cares. We need more Doctors like him.



Aetna, Anthem, BCBS Medicare, CarePartners of Connecticut, Cigna Healthcare, Colonial Cooperative Care, Community Health Network of Connecticut, Inc., Connecticare, Connecticare Commercial, Connecticare Medicare, Corvel, Coventry, Essence Healthcare, Evercare, First Health Group Corp., Focus, Harvard Pilgrim, Health Connecticut, Health Direct, Health New England, Healthy Connecticut, Multiplan, Northeast Health Direct, One Health Plan/ Great-West Healthcare, Oxford Health Plans, Prime Health Services, Private Health Care Systems, Inc., Senior Whole Health, United Healthcare, WellCare of Connecticut, Inc.

This information is subject to change at any time. Please check with your insurance provider before scheduling your appointment or receiving services to confirm they are a participating member of the Hartford HealthCare network.