Is S22.5 a billable ICD-10-CM code?

No. S22.5 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does S22.5 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).

S22.5

S22.5 — Flail chest

Non-billable headerICD-10-CM

S22.5 is a non-billable header ICD-10-CM code for flail chest. 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 S22

A: initial encounter for closed fracture
B: initial encounter for open fracture
D: subsequent encounter for fracture with routine healing
G: subsequent encounter for fracture with delayed healing
K: subsequent encounter for fracture with nonunion
S: sequela

Other codes that can never be billed with S22.5

These codes carry an Excludes1 note pointing at S22.5. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading S22.5 alone.

S22.4Multiple fractures of ribs
S28.0Crushed chest
S28.0XXACrushed chest, initial encounter
S28.0XXDCrushed chest, subsequent encounter
S28.0XXSCrushed chest, sequela

Risk adjustment

S22.5 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.

How S22.5 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to S22.5.

Flail›chest

Code to one of these instead S22.5

6 child codes. Green means billable.

Related codes at this level

Codes that share S22. If S22.5 is not quite right, the correct code is usually one of these.

Questions about S22.5

Is S22.5 a billable ICD-10-CM code?: No. S22.5 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does S22.5 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).