ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.1 > T23.11 T23.11 Burn of first degree of thumb (nail) Non-Billable/Non-Specific Codes T23.111Burn of first degree of right thumb (nail)T23.111A..., initial encounterT23.111D..., subsequent encounterT23.111S..., sequelaT23.112Burn of first degree of left thumb (nail)T23.112A..., initial encounterT23.112D..., subsequent encounterT23.112S..., sequelaT23.119Burn of first degree of unspecified thumb (nail)T23.119A..., initial encounterT23.119D..., subsequent encounterT23.119S..., sequela