ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.2 > T23.21 T23.21 Burn of second degree of thumb (nail) Non-Billable/Non-Specific Codes T23.211Burn of second degree of right thumb (nail)T23.211A..., initial encounterT23.211D..., subsequent encounterT23.211S..., sequelaT23.212Burn of second degree of left thumb (nail)T23.212A..., initial encounterT23.212D..., subsequent encounterT23.212S..., sequelaT23.219Burn of second degree of unspecified thumb (nail)T23.219A..., initial encounterT23.219D..., subsequent encounterT23.219S..., sequela