ICD-10-CM 2027
ICD-10 code for thorax sprain
From the official ICD-10-CM alphabetic index entry “Sprain (joint) (ligament) › thorax”. Page updated September 29, 2026.
About coding thorax sprain
The ICD-10-CM code for thorax sprain is S23.9 (Sprain of unspecified parts of thorax). The official index lists 3 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on S23.9.
Within S23, choose S23.9 (Sprain of unspecified parts of thorax) only when documentation doesn't support a more specific option: traumatic rupture of thoracic intervertebral disc (S23.0), subluxation and dislocation of thoracic vertebra (S23.1), dislocation of other and unspecified parts of thorax (S23.2), sprain of ligaments of thoracic spine (S23.3), sprain of ribs and sternum (S23.4) and sprain of other specified parts of thorax (S23.8).
Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
More specific thorax sprain codes (official index)
Common questions about thorax sprain ICD-10 codes
What is the ICD-10 code for thorax sprain?
- S23.9 — Sprain of unspecified parts of thorax (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: S23.41, S23.8, S23.3.
What is the ICD-10 code for ribs thorax sprain?
- S23.41 — Sprain of ribs (header code; choose a more specific subcode).
What is the ICD-10 code for spine thorax sprain?
- S23.3 — Sprain of ligaments of thoracic spine (header code; choose a more specific subcode).
Is S23.9 billable?
- No. S23.9 is a header code. Report one of its more specific subcodes instead.