ICD-10-CM > S00-T88 > T20-T25 > T22 > T22.5 > T22.55 > T22.559 T22.559 Corrosion of first degree of unspecified shoulder Non-Billable/Non-Specific Codes T22.559A..., initial encounterT22.559D..., subsequent encounterT22.559S..., sequela