ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.5 > T23.53 T23.53 Corrosion of first degree of multiple fingers (nail), not including thumb Non-Billable/Non-Specific Codes T23.531Corrosion of first degree of multiple right fingers (nail), not including thumbT23.531A..., initial encounterT23.531D..., subsequent encounterT23.531S..., sequelaT23.532Corrosion of first degree of multiple left fingers (nail), not including thumbT23.532A..., initial encounterT23.532D..., subsequent encounterT23.532S..., sequelaT23.539Corrosion of first degree of unspecified multiple fingers (nail), not including thumbT23.539A..., initial encounterT23.539D..., subsequent encounterT23.539S..., sequela