ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.6 > T23.64 T23.64 Corrosion of second degree of multiple fingers (nail), including thumb Non-Billable/Non-Specific Codes T23.641Corrosion of second degree of multiple right fingers (nail), including thumbT23.641A..., initial encounterT23.641D..., subsequent encounterT23.641S..., sequelaT23.642Corrosion of second degree of multiple left fingers (nail), including thumbT23.642A..., initial encounterT23.642D..., subsequent encounterT23.642S..., sequelaT23.649Corrosion of second degree of unspecified multiple fingers (nail), including thumbT23.649A..., initial encounterT23.649D..., subsequent encounterT23.649S..., sequela