ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.4 > T23.44 T23.44 Corrosion of unspecified degree of multiple fingers (nail), including thumb Non-Billable/Non-Specific Codes T23.441Corrosion of unspecified degree of multiple right fingers (nail), including thumbT23.441A..., initial encounterT23.441D..., subsequent encounterT23.441S..., sequelaT23.442Corrosion of unspecified degree of multiple left fingers (nail), including thumbT23.442A..., initial encounterT23.442D..., subsequent encounterT23.442S..., sequelaT23.449Corrosion of unspecified degree of unspecified multiple fingers (nail), including thumbT23.449A..., initial encounterT23.449D..., subsequent encounterT23.449S..., sequela