ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.5 > T23.54 > T23.541 T23.541 Corrosion of first degree of multiple right fingers (nail), including thumb Non-Billable/Non-Specific Codes T23.541A..., initial encounterT23.541D..., subsequent encounterT23.541S..., sequela