S20.9Superficial injury of unspecified parts of thorax

S20.9 is the ICD-10-CM diagnosis code for superficial injury of unspecified parts of thorax. It belongs to category S20 (superficial injury of thorax), block S20-S29 (injuries to the thorax) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 7 subcodes must be used instead.

Within S20, choose S20.9 (Superficial injury of unspecified parts of thorax) only when documentation doesn't support a more specific option: contusion of breast (S20.0), other and unspecified superficial injuries of breast (S20.1), contusion of thorax (S20.2), other and unspecified superficial injuries of front wall of thorax (S20.3) and other and unspecified superficial injuries of back wall of thorax (S20.4).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

Don't report S20.9 together with the conditions in its Excludes1 note: contusion of thorax NOS (S20.20).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.