ICD-10-CM > S00-T88 > S60-S69 > S63 > S63.6 > S63.60 > S63.609 S63.609 Unspecified sprain of unspecified thumb Non-Billable/Non-Specific Codes S63.609A..., initial encounterS63.609D..., subsequent encounterS63.609S..., sequela