ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.6 > T23.66 > T23.661 T23.661 Corrosion of second degree back of right hand Non-Billable/Non-Specific Codes T23.661A..., initial encounterT23.661D..., subsequent encounterT23.661S..., sequela