Kim's son, Jared, has Byler's Disease, which caused him to be severely jaundiced and put him at risk for liver failure. He was in the hospital to have a biliary diversion which would allow the bile to drain out of his abdomen.
The initial plan was to use part of his intestine to make the stoma, but Alex Karev had the idea to use his appendix instead, removing the need to cut into his healthy intestine. The surgery was successful and after surgery, Jared’s skin was a more normal color.
Kim has a son, Jared, who was hospitalized due to his Byler's Disease.