ICD-10-CM > S00-T88 > S90-S99 > S93 > S93.4 > S93.42 > S93.421 S93.421 Sprain of deltoid ligament of right ankle Non-Billable/Non-Specific Codes S93.421A..., initial encounterS93.421D..., subsequent encounterS93.421S..., sequela