ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.4 > S20.41 > S20.419 S20.419 Abrasion of unspecified back wall of thorax Non-Billable/Non-Specific Codes S20.419A..., initial encounterS20.419D..., subsequent encounterS20.419S..., sequela