ICD-10-CM > S00-T88 > T20-T25 > T20 > T20.4 > T20.45 T20.45 Corrosion of unspecified degree of scalp [any part] Non-Billable/Non-Specific Codes T20.45XA..., initial encounterT20.45XD..., subsequent encounterT20.45XS..., sequela