ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.7 > T23.73 T23.73 Corrosion of third degree of multiple fingers (nail), not including thumb Non-Billable/Non-Specific Codes T23.731Corrosion of third degree of multiple right fingers (nail), not including thumbT23.731A..., initial encounterT23.731D..., subsequent encounterT23.731S..., sequelaT23.732Corrosion of third degree of multiple left fingers (nail), not including thumbT23.732A..., initial encounterT23.732D..., subsequent encounterT23.732S..., sequelaT23.739Corrosion of third degree of unspecified multiple fingers (nail), not including thumbT23.739A..., initial encounterT23.739D..., subsequent encounterT23.739S..., sequela