ICD-10-CM > S00-T88 > S20-S29 > S20 > S20.4 > S20.47 S20.47 Other superficial bite of back wall of thorax Non-Billable/Non-Specific Type 1 Excludes open bite of back wall of thorax (S21.24) Codes S20.471Other superficial bite of right back wall of thoraxS20.471A..., initial encounterS20.471D..., subsequent encounterS20.471S..., sequelaS20.472Other superficial bite of left back wall of thoraxS20.472A..., initial encounterS20.472D..., subsequent encounterS20.472S..., sequelaS20.479Other superficial bite of unspecified back wall of thoraxS20.479A..., initial encounterS20.479D..., subsequent encounterS20.479S..., sequela