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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

Hospitals and Organizations

  • Hartford HealthCare Medical Group
  • Backus Hospital
  • Integrated Care Partners


The Cleveland Clinic

Medical School
LaSalle University

SUNY Upstate Medical University at Syracuse


Verified Patient Reviews

5 out of 5 stars

Dr. C is always very professional, calm, clear, informative & a gentleman to interface with! More Doctors should take a page from his book as to how to interact with patients!

5 out of 5 stars

Genuinely caring and supportive

5 out of 5 stars

Dr Casillas is so excellent explaining everything. He made my visit experience well

5 out of 5 stars

The doctor had excellent illustrations to help me understand why surgery was recommended for my case. He was clear and honest about the recovery issues. Any risks of the surgery were not mentioned. When I asked about post surgical infections he assured me they were extremely rare.

5 out of 5 stars

A very good experience throughout.

5 out of 5 stars

10/10 recommend. *Dr. Casillas was thoughtful and good.

5 out of 5 stars

First visit to this doctor. What a positive experience! Caring, thoughtful, informative, clear. Took time and reduced my fears. Five stars!

Other Reviews from Around the Web



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

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.