ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.0 > T23.01 > T23.012 T23.012 Burn of unspecified degree of left thumb (nail) Non-Billable/Non-Specific Codes T23.012A..., initial encounterT23.012D..., subsequent encounterT23.012S..., sequela