ICD-10-CM > K00-K95 > K50-K52 > K52 > K52.8 > K52.83 K52.83 Microscopic colitis Non-Billable/Non-Specific Codes K52.831Collagenous colitisK52.832Lymphocytic colitisK52.838Other microscopic colitisK52.839Microscopic colitis, unspecified