ICD-10-CM > S00-T88 > T20-T25 > T23 > T23.6 > T23.66 T23.66 Corrosion of second degree of back of hand Non-Billable/Non-Specific Codes T23.661Corrosion of second degree back of right handT23.661A..., initial encounterT23.661D..., subsequent encounterT23.661S..., sequelaT23.662Corrosion of second degree back of left handT23.662A..., initial encounterT23.662D..., subsequent encounterT23.662S..., sequelaT23.669Corrosion of second degree back of unspecified handT23.669A..., initial encounterT23.669D..., subsequent encounterT23.669S..., sequela