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