ICD-10-CM 2027 diagnosis code

S93.409Sprain of unspecified ligament of unspecified ankle

Not billable — use a more specific codeRequires 7th character

S93.409 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About S93.409

S93.409 is the ICD-10-CM diagnosis code for sprain of unspecified ligament of unspecified ankle. It belongs to category S93 (dislocation and sprain of joints and ligaments at ankle, foot and toe level), block S90-S99 (injuries to the ankle and foot) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within S93.40, choose S93.409 (unspecified ankle) only when documentation doesn't support a more specific option: right ankle (S93.401) and left ankle (S93.402).

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.

7th character

The appropriate 7th character is to be added to each code from category S93

Ainitial encounterS93.409A
Dsubsequent encounterS93.409D
SsequelaS93.409S

Notes that apply from higher levels

Instructions written at a parent level also apply to S93.409.

› From S93.4 Sprain of ankle

Excludes2

injury of Achilles tendon (S86.0-)

› From S93 Dislocation and sprain of joints and ligaments at ankle, foot and toe level

Includes

avulsion of joint or ligament of ankle, foot and toe
laceration of cartilage, joint or ligament of ankle, foot and toe
sprain of cartilage, joint or ligament of ankle, foot and toe
traumatic hemarthrosis of joint or ligament of ankle, foot and toe
traumatic rupture of joint or ligament of ankle, foot and toe
traumatic subluxation of joint or ligament of ankle, foot and toe
traumatic tear of joint or ligament of ankle, foot and toe

Excludes2

strain of muscle and tendon of ankle and foot (S96.-)

Code also

any associated open wound

Broader instructions also apply from S90-S99 Injuries to the ankle and foot and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about S93.409

Is S93.409 billable?: No. S93.409 is a header code. Report one of its more specific subcodes instead.