ICD-10-CM > S00-T88 > S80-S89 > S83 > S83.4 > S83.42 > S83.429 S83.429 Sprain of lateral collateral ligament of unspecified knee Non-Billable/Non-Specific Codes S83.429A..., initial encounterS83.429D..., subsequent encounterS83.429S..., sequela