S23.420S – Sprain of sternoclavicular (joint) (ligament), sequela
ICD-10-CM 2027 diagnosis code · Injuries to the thorax
- Code
S23.420S(claims format:S23420S)- Description
- Sprain of sternoclavicular (joint) (ligament), sequela
- Billable
- No – deleted from the code set
- Chapter
- 19. Injury, poisoning and certain other consequences of external causes (S00-T88)
- Block
- S20-S29 Injuries to the thorax
- Parent codes
- S23 › S23.4 › S23.42
This code was deleted
S23.420S (Sprain of sternoclavicular (joint) (ligament), sequela) is not valid for dates of service on or after October 1, 2026. See S23.42 for the current codes in this category.
7th character values
Codes in this category need a 7th character to describe the encounter or episode of care.
| Character | Meaning |
|---|---|
A | initial encounter |
D | subsequent encounter |
S | sequela |
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
S23 – Dislocation and sprain of joints and ligaments of thorax
- 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
- any associated open wound
- The appropriate 7th character is to be added to each code from category S23
Block S20-S29
- injuries of breast
- injuries of chest (wall)
- injuries of interscapular area
- burns and corrosions (T20-T32)
- effects of foreign body in bronchus (T17.5)
- effects of foreign body in esophagus (T18.1)
- effects of foreign body in lung (T17.8)
- effects of foreign body in trachea (T17.4)
- frostbite (T33-T34)
- injuries of axilla
- injuries of clavicle
- injuries of scapular region
- injuries of shoulder
- insect bite or sting, venomous (T63.4)
Related codes in S23.42
- S23.421 – Sprain of chondrosternal jointHeader
- S23.428 – Other sprain of sternumHeader
- S23.429 – Unspecified sprain of sternumHeader
- S23.420 – Sprain of sternoclavicular (joint) (ligament)Header
- S23.420A – Sprain of sternoclavicular (joint) (ligament), initial encounterHeader
- S23.420D – Sprain of sternoclavicular (joint) (ligament), subsequent encounterHeader
Frequently asked questions
What is ICD-10 code S23.420S?
S23.420S is the ICD-10-CM code for sprain of sternoclavicular (joint) (ligament), sequela, in the block S20-S29 (Injuries to the thorax).
Is S23.420S a billable code?
No. It was deleted effective October 1, 2026.
What category does S23.420S belong to?
It belongs to category S23 – Dislocation and sprain of joints and ligaments of thorax.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.