ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.4 > T23.40 > T23.402 T23.402 Corrosion of unspecified degree of left hand, unspecified site Non-Billable/Non-Specific Codes T23.402A..., initial encounterT23.402D..., subsequent encounterT23.402S..., sequela