ICD-10-CM > S00-T88 > S90-S99 > S93 > S93.4 > S93.40 > S93.409 S93.409 Sprain of unspecified ligament of unspecified ankle Non-Billable/Non-Specific Codes S93.409A..., initial encounterS93.409D..., subsequent encounterS93.409S..., sequela