ICD-10-CM > K00-K95 > K55-K64 > K63 > K63.8 K63.8 Other specified diseases of intestine Non-Billable/Non-Specific Codes K63.81Dieulafoy lesion of intestineK63.82Intestinal microbial overgrowthK63.821Small intestinal bacterial overgrowthK63.8211Small intestinal bacterial overgrowth, hydrogen-subtypeK63.8212Small intestinal bacterial overgrowth, hydrogen sulfide-subtypeK63.8219Small intestinal bacterial overgrowth, unspecifiedK63.822Small intestinal fungal overgrowthK63.829Intestinal methanogen overgrowth, unspecifiedK63.89Other specified diseases of intestine