ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.4 > T23.49 > T23.499 T23.499 Corrosion of unspecified degree of multiple sites of unspecified wrist and hand Non-Billable/Non-Specific Codes T23.499A..., initial encounterT23.499D..., subsequent encounterT23.499S..., sequela