ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.7 > T23.73 > T23.731 T23.731 Corrosion of third degree of multiple right fingers (nail), not including thumb Non-Billable/Non-Specific Codes T23.731A..., initial encounterT23.731D..., subsequent encounterT23.731S..., sequela