ICD-10-CM > K00-K95 > K55-K64 > K58 K58 Irritable bowel syndrome Non-Billable/Non-Specific Includes irritable colonspastic colon Codes K58.0Irritable bowel syndrome with diarrheaK58.1Irritable bowel syndrome with constipationK58.2Mixed irritable bowel syndromeK58.8Other irritable bowel syndromeK58.9Irritable bowel syndrome, unspecified