ICD-10-CM > S00-T88 > S80-S89 > S83 > S83.8 > S83.8X > S83.8X9 S83.8X9 Sprain of other specified parts of unspecified knee Non-Billable/Non-Specific Codes S83.8X9A..., initial encounterS83.8X9D..., subsequent encounterS83.8X9S..., sequela