ICD-10-CM > K00-K95 > K55-K64 > K59 > K59.3 K59.3 Megacolon, not elsewhere classified Non-Billable/Non-Specific Applicable To Dilatation of colon Code First , if applicable (T51-T65) to identify toxic agent Type 1 Excludes congenital megacolon (aganglionic) (Q43.1)megacolon (due to) (in) Chagas' disease (B57.32)megacolon (due to) (in) Clostridium difficile (A04.7-)megacolon (due to) (in) Hirschsprung's disease (Q43.1) Codes K59.31Toxic megacolonK59.39Other megacolon