S23.420A Sprain of sternoclavicular (joint) (ligament), initial encounter

Billable ICD-10-CM code, FY2026.

Built from S23.420 with 7th character A (initial encounter).

Applies from S23 Dislocation and sprain of joints and ligaments of thorax

Includes

• avulsion of joint or ligament of thorax
• laceration of cartilage, joint or ligament of thorax
• sprain of cartilage, joint or ligament of thorax
• traumatic hemarthrosis of joint or ligament of thorax
• traumatic rupture of joint or ligament of thorax
• traumatic subluxation of joint or ligament of thorax
• traumatic tear of joint or ligament of thorax

Excludes2 (not included here)

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

Code also

• any associated open wound

7th character note

• The appropriate 7th character is to be added to each code from category S23

7th character required

• A — initial encounter
• D — subsequent encounter
• S — sequela

Nearby codes

• S23.41XA Sprain of ribs, initial encounter
• S23.41XD Sprain of ribs, subsequent encounter
• S23.41XS Sprain of ribs, sequela
• S23.42 Sprain of sternum
• S23.420 Sprain of sternoclavicular (joint) (ligament)
• S23.420A Sprain of sternoclavicular (joint) (ligament), initial encounter (this code)
• S23.420D Sprain of sternoclavicular (joint) (ligament), subsequent encounter
• S23.420S Sprain of sternoclavicular (joint) (ligament), sequela
• S23.421 Sprain of chondrosternal joint
• S23.421A Sprain of chondrosternal joint, initial encounter
• S23.421D Sprain of chondrosternal joint, subsequent encounter