ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.4 > T23.43 T23.43 Corrosion of unspecified degree of multiple fingers (nail), not including thumb Non-Billable/Non-Specific Codes T23.431Corrosion of unspecified degree of multiple right fingers (nail), not including thumbT23.431A..., initial encounterT23.431D..., subsequent encounterT23.431S..., sequelaT23.432Corrosion of unspecified degree of multiple left fingers (nail), not including thumbT23.432A..., initial encounterT23.432D..., subsequent encounterT23.432S..., sequelaT23.439Corrosion of unspecified degree of unspecified multiple fingers (nail), not including thumbT23.439A..., initial encounterT23.439D..., subsequent encounterT23.439S..., sequela