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