ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.4 > S20.40 > S20.402 S20.402 Unspecified superficial injuries of left back wall of thorax Non-Billable/Non-Specific Codes S20.402A..., initial encounterS20.402D..., subsequent encounterS20.402S..., sequela