ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.2 > S20.22 S20.22 Contusion of back wall of thorax Non-Billable/Non-Specific Codes S20.221Contusion of right back wall of thoraxS20.221A..., initial encounterS20.221D..., subsequent encounterS20.221S..., sequelaS20.222Contusion of left back wall of thoraxS20.222A..., initial encounterS20.222D..., subsequent encounterS20.222S..., sequelaS20.223Contusion of bilateral back wall of thoraxS20.223A..., initial encounterS20.223D..., subsequent encounterS20.223S..., sequelaS20.224Contusion of middle back wall of thoraxS20.224A..., initial encounterS20.224D..., subsequent encounterS20.224S..., sequelaS20.229Contusion of unspecified back wall of thoraxS20.229A..., initial encounterS20.229D..., subsequent encounterS20.229S..., sequela