S23.421

S23.421: Sprain of chondrosternal joint

Non-billable headerICD-10-CM

S23.421 is a non-billable header ICD-10-CM code for sprain of chondrosternal joint. 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 S23

A: initial encounter
D: subsequent encounter
S: sequela

Excludes2 inherited from the categories above S23.421

Not part of this code, but both may be coded when both are present.

Written on S23: Dislocation and sprain of joints and ligaments of thorax

dislocation, sprain of sternoclavicular joint (S43.2, S43.6)
strain of muscle or tendon of thorax (S29.01-)

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Alphabetic index entries that lead here

Sprain›chondrosternal
Sprain›sternum›chondrosternal joint

Code history

Unchanged in every release from FY2024 to FY2027.

Code to one of these instead S23.421

3 child codes. Green means billable.