Is S20.4 a billable ICD-10-CM code?

No. S20.4 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does S20.4 sit in the tabular list?

Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the thorax (S20-S29).

S20.4

S20.4 — Other and unspecified superficial injuries of back wall of thorax

Non-billable headerICD-10-CM

S20.4 is a non-billable header ICD-10-CM code for other and unspecified superficial injuries of back wall of thorax. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.

This code requires a 7th character

The appropriate 7th character is to be added to each code from category S20

A: initial encounter
D: subsequent encounter
S: sequela

Other codes that can never be billed with S20.4

These codes carry an Excludes1 note pointing at S20.4. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading S20.4 alone.

S21.25Open bite of back wall of thorax without penetration into thoracic cavity
S21.45Open bite of back wall of thorax with penetration into thoracic cavity

Risk adjustment

S20.4 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code to one of these instead S20.4

7 child codes. Green means billable.

Related codes at this level

Codes that share S20. If S20.4 is not quite right, the correct code is usually one of these.

Questions about S20.4

Is S20.4 a billable ICD-10-CM code?: No. S20.4 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does S20.4 sit in the tabular list?: Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Injuries to the thorax (S20-S29).