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