ICD-10-CM > S00-T88 > S90-S99 > S93 > S93.4 > S93.43 S93.43 Sprain of tibiofibular ligament Non-Billable/Non-Specific Codes S93.431Sprain of tibiofibular ligament of right ankleS93.431A..., initial encounterS93.431D..., subsequent encounterS93.431S..., sequelaS93.432Sprain of tibiofibular ligament of left ankleS93.432A..., initial encounterS93.432D..., subsequent encounterS93.432S..., sequelaS93.439Sprain of tibiofibular ligament of unspecified ankleS93.439A..., initial encounterS93.439D..., subsequent encounterS93.439S..., sequela