ICD-10-CM > S00-T88 > S80-S89 > S83 > S83.4 > S83.40 > S83.401 S83.401 Sprain of unspecified collateral ligament of right knee Non-Billable/Non-Specific Codes S83.401A..., initial encounterS83.401D..., subsequent encounterS83.401S..., sequela