ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.6 > T23.63 T23.63 Corrosion of second degree of multiple fingers (nail), not including thumb Non-Billable/Non-Specific Codes T23.631Corrosion of second degree of multiple right fingers (nail), not including thumbT23.631A..., initial encounterT23.631D..., subsequent encounterT23.631S..., sequelaT23.632Corrosion of second degree of multiple left fingers (nail), not including thumbT23.632A..., initial encounterT23.632D..., subsequent encounterT23.632S..., sequelaT23.639Corrosion of second degree of unspecified multiple fingers (nail), not including thumbT23.639A..., initial encounterT23.639D..., subsequent encounterT23.639S..., sequela