ICD-10 code for knee injury

The ICD-10-CM code for knee injury is S89.9 (Unspecified injury of lower leg). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on S89.9.

Within S89, choose S89.9 (Unspecified injury of lower leg) only when documentation doesn't support a more specific option: physeal fracture of upper end of tibia (S89.0), physeal fracture of lower end of tibia (S89.1), physeal fracture of upper end of fibula (S89.2), physeal fracture of lower end of fibula (S89.3) and other specified injuries of lower leg (S89.8).

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.