S20.4 - Other and unspecified superficial injuries of back wall of thorax
S20.47 - Other superficial bite of back wall of thorax
Excludes 1:
-open bite of back wall of thorax S21.24)
S20.471 - Other superficial bite of right back wall of thorax
S20.472 - Other superficial bite of left back wall of thorax
S20.479 - Other superficial bite of unspecified back wall of thorax