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ICD-10 CM Code T23.42

T23.42 Corrosion of unspecified degree of single finger (nail) except thumb

T23.421 Corrosion of unspecified degree of single right finger (nail) except thumb
T23.422 Corrosion of unspecified degree of single left finger (nail) except thumb
T23.429 Corrosion of unspecified degree of unspecified single finger (nail) except thumb

7th Character

The appropriate 7th character is to be added to each code from category T23

A - initial encounter
D - subsequent encounter
S - sequela

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