ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.4 > T23.49 > T23.491 T23.491 Corrosion of unspecified degree of multiple sites of right wrist and hand Non-Billable/Non-Specific Codes T23.491A..., initial encounterT23.491D..., subsequent encounterT23.491S..., sequela