ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.3 > S20.31 S20.31 Abrasion of front wall of thorax Non-Billable/Non-Specific Codes S20.311Abrasion of right front wall of thoraxS20.311A..., initial encounterS20.311D..., subsequent encounterS20.311S..., sequelaS20.312Abrasion of left front wall of thoraxS20.312A..., initial encounterS20.312D..., subsequent encounterS20.312S..., sequelaS20.313Abrasion of bilateral front wall of thoraxS20.313A..., initial encounterS20.313D..., subsequent encounterS20.313S..., sequelaS20.314Abrasion of middle front wall of thoraxS20.314A..., initial encounterS20.314D..., subsequent encounterS20.314S..., sequelaS20.319Abrasion of unspecified front wall of thoraxS20.319A..., initial encounterS20.319D..., subsequent encounterS20.319S..., sequela