S83.9Sprain of unspecified site of knee

S83.9 is the ICD-10-CM diagnosis code for sprain of unspecified site of knee. It belongs to category S83 (dislocation and sprain of joints and ligaments of knee), 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 S83, choose S83.9 (Sprain of unspecified site of knee) only when documentation doesn't support a more specific option: subluxation and dislocation of patella (S83.0), subluxation and dislocation of knee (S83.1), tear of meniscus, current injury (S83.2), tear of articular cartilage of knee, current (S83.3), sprain of collateral ligament of knee (S83.4), sprain of cruciate ligament of knee (S83.5), sprain of the superior tibiofibular joint and ligament (S83.6) and sprain of other specified parts of knee (S83.8).

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.