ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.3 > T23.31 T23.31 Burn of third degree of thumb (nail) Non-Billable/Non-Specific Codes T23.311Burn of third degree of right thumb (nail)T23.311A..., initial encounterT23.311D..., subsequent encounterT23.311S..., sequelaT23.312Burn of third degree of left thumb (nail)T23.312A..., initial encounterT23.312D..., subsequent encounterT23.312S..., sequelaT23.319Burn of third degree of unspecified thumb (nail)T23.319A..., initial encounterT23.319D..., subsequent encounterT23.319S..., sequela