ICD-10-CM 2027
ICD-10 code for ankle sprain
From the official ICD-10-CM alphabetic index entry “Sprain (joint) (ligament) › ankle”. Page updated September 29, 2026.
About coding ankle sprain
The ICD-10-CM code for ankle sprain is S93.40 (Sprain of unspecified ligament of ankle). The official index lists 4 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on S93.40.
Within S93.4, choose S93.40 (unspecified ligament of ankle) only when documentation doesn't support a more specific option: calcaneofibular ligament (S93.41), deltoid ligament (S93.42), tibiofibular ligament (S93.43) and other ligament of ankle (S93.49).
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 ankle sprain codes (official index)
Common questions about ankle sprain ICD-10 codes
What is the ICD-10 code for ankle sprain?
- S93.40 — Sprain of unspecified ligament of ankle (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: S93.41, S93.42, S93.49, S93.43.
What is the ICD-10 code for calcaneofibular ligament ankle sprain?
- S93.41 — Sprain of calcaneofibular ligament (header code; choose a more specific subcode).
What is the ICD-10 code for deltoid ligament ankle sprain?
- S93.42 — Sprain of deltoid ligament (header code; choose a more specific subcode).
What is the ICD-10 code for tibiofibular ligament ankle sprain?
- S93.43 — Sprain of tibiofibular ligament (header code; choose a more specific subcode).
Is S93.40 billable?
- No. S93.40 is a header code. Report one of its more specific subcodes instead.