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