Other streptococcal arthritis, left knee

This code signifies an inflammatory joint condition affecting the left knee, specifically caused by a streptococcal bacterial infection, but not classified as a pyogenic arthritis. It indicates an immune response to streptococcal bacteria manifesting as arthritis, rather than direct bacterial invasion of the joint.

Apply this code when documentation clearly states "streptococcal arthritis" of the left knee, and specifies that it is not purulent or directly infectious (e.g., "reactive streptococcal arthritis"). This is appropriate for cases where a preceding streptococcal infection (e.g., strep throat) is identified as the etiology for the subsequent knee inflammation.

• Ensure documentation specifies "left knee" and "streptococcal" etiology.
• Distinguish from pyogenic (suppurative) arthritis; this code is for "other" streptococcal arthritis.
• Consider an additional code for the underlying streptococcal infection, if known and still active.