ICD-10-CM > K00-K95 > K50-K52 > K51 > K51.5 > K51.51 K51.51 Left sided colitis with complications Non-Billable/Non-Specific Codes K51.511Left sided colitis with rectal bleedingK51.512Left sided colitis with intestinal obstructionK51.513Left sided colitis with fistulaK51.514Left sided colitis with abscessK51.518Left sided colitis with other complicationK51.519Left sided colitis with unspecified complications