ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.1 > T23.12 > T23.121 T23.121 Burn of first degree of single right finger (nail) except thumb Non-Billable/Non-Specific Codes T23.121A..., initial encounterT23.121D..., subsequent encounterT23.121S..., sequela