S86.9Injury of unspecified muscle and tendon at lower leg level

S86.9 is the ICD-10-CM diagnosis code for injury of unspecified muscle and tendon at lower leg level. It belongs to category S86 (injury of muscle, fascia and tendon at lower leg level), block S80-S89 (injuries to the knee and lower leg) 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 4 subcodes must be used instead.

Within S86, choose S86.9 (unspecified muscle and tendon at lower leg level) only when documentation doesn't support a more specific option: achilles tendon (S86.0), other muscle(s) and tendon(s) of posterior muscle group at lower leg level (S86.1), muscle(s) and tendon(s) of anterior muscle group at lower leg level (S86.2), muscle(s) and tendon(s) of peroneal muscle group at lower leg level (S86.3) and other muscles and tendons at lower leg level (S86.8).

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.