I worked on a surgical floor for 17 years. There is no specialist for colon surgeries like there is for heart & lung surgeries and for female/urinary surgeries. Any reputable surgeon can do colon surgeries. There are some who specialize in colon surgeries when someone needs a colostomy but doesn't want the bag for waste; there's a special surgery for that, usually done at teaching hospitals. Just make sure he/she is board certified. Good luck.