ICD-10-CM > S00-T88 > S80-S89 > S83 > S83.5 > S83.50 > S83.509 S83.509 Sprain of unspecified cruciate ligament of unspecified knee Non-Billable/Non-Specific Codes S83.509A..., initial encounterS83.509D..., subsequent encounterS83.509S..., sequela