ICD-10-CM > S00-T88 > S90-S99 > S90 > S90.5 > S90.54 S90.54 External constriction of ankle Non-Billable/Non-Specific Codes S90.541External constriction, right ankleS90.541A..., initial encounterS90.541D..., subsequent encounterS90.541S..., sequelaS90.542External constriction, left ankleS90.542A..., initial encounterS90.542D..., subsequent encounterS90.542S..., sequelaS90.549External constriction, unspecified ankleS90.549A..., initial encounterS90.549D..., subsequent encounterS90.549S..., sequela