Postimmunization arthropathy, left ankle and foot

This code signifies joint inflammation and pain in the left ankle and foot that develops as a direct adverse reaction to an immunization. It represents a sterile arthropathy, meaning the joint inflammation is not due to an active infection but rather an immune response triggered by the vaccine.

Use this code when documentation clearly links arthropathy of the left ankle and foot to a recent immunization. This typically occurs within days to weeks post-vaccination. Supporting documentation should include a history of recent immunization, symptoms localized to the left ankle and foot, and exclusion of other causes of arthropathy.

• Ensure the documentation explicitly states a causal link between the immunization and the arthropathy.
• Do not use this code for infectious arthritis following immunization; instead, code the specific infectious agent.
• Always sequence this code after the T-code identifying the specific vaccine causing the adverse effect (e.g., T50.B1XA for adverse effect of measles, mumps, and rubella vaccine).