ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.2 > T23.21 > T23.219 T23.219 Burn of second degree of unspecified thumb (nail) Non-Billable/Non-Specific Codes T23.219A..., initial encounterT23.219D..., subsequent encounterT23.219S..., sequela