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