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