ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.5 > T23.54 T23.54 Corrosion of first degree of multiple fingers (nail), including thumb Non-Billable/Non-Specific Codes T23.541Corrosion of first degree of multiple right fingers (nail), including thumbT23.541A..., initial encounterT23.541D..., subsequent encounterT23.541S..., sequelaT23.542Corrosion of first degree of multiple left fingers (nail), including thumbT23.542A..., initial encounterT23.542D..., subsequent encounterT23.542S..., sequelaT23.549Corrosion of first degree of unspecified multiple fingers (nail), including thumbT23.549A..., initial encounterT23.549D..., subsequent encounterT23.549S..., sequela