S84.9Injury of unspecified nerve at lower leg level

S84.9 is the ICD-10-CM diagnosis code for injury of unspecified nerve at lower leg level. It belongs to category S84 (injury of nerves 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 3 subcodes must be used instead.

Within S84, choose S84.9 (unspecified nerve at lower leg level) only when documentation doesn't support a more specific option: tibial nerve at lower leg level (S84.0), peroneal nerve at lower leg level (S84.1), cutaneous sensory nerve at lower leg level (S84.2) and other nerves at lower leg level (S84.8).

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.