Other reactive arthropathies, left ankle and foot

This code signifies an inflammatory joint condition affecting the left ankle and foot, which is triggered by an infection elsewhere in the body but is not directly caused by the infection itself within the joint. It represents a sterile inflammatory response, often post-infectious, leading to pain, swelling, and stiffness in the specified anatomical region.

Apply this code when documentation indicates a diagnosis of reactive arthritis, Reiter's syndrome, or other post-infectious arthropathy specifically localized to the left ankle and foot. Supporting documentation should clearly identify the reactive nature of the arthropathy and specify the affected laterality.

• Ensure the documentation explicitly states "left ankle and foot" to justify this specific laterality and site.
• Do not use this code for infectious arthritis; that would require a code from the M00-M01 series.
• Consider sequencing a code for the underlying infection, if known and still active, as the primary diagnosis, with this code as a secondary diagnosis.