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