ICD-10-CM > S00-T88 > S30-S39 > S36 > S36.4 > S36.40 S36.40 Unspecified injury of small intestine Non-Billable/Non-Specific Codes S36.400Unspecified injury of duodenumS36.400A..., initial encounterS36.400D..., subsequent encounterS36.400S..., sequelaS36.408Unspecified injury of other part of small intestineS36.408A..., initial encounterS36.408D..., subsequent encounterS36.408S..., sequelaS36.409Unspecified injury of unspecified part of small intestineS36.409A..., initial encounterS36.409D..., subsequent encounterS36.409S..., sequela