Arthropathy associated with hypersensitivity reaction

This code signifies joint inflammation or disease that arises as a direct consequence of an abnormal immune response to a foreign substance, such as a drug, vaccine, or environmental allergen. It represents a systemic reaction manifesting with arthritic symptoms.

Apply this code when documentation clearly links arthropathy to a hypersensitivity reaction, often seen in cases of serum sickness, drug-induced arthritis, or allergic reactions affecting joints. Supporting documentation should specify both the joint involvement and the identified allergen or precipitating agent.

• Always code the underlying hypersensitivity reaction (e.g., drug allergy, serum sickness) first, if known and applicable, as the primary diagnosis.
• Distinguish from infectious arthritis or other inflammatory arthropathies not directly caused by a hypersensitivity response.
• Ensure the medical record explicitly states the causal relationship between the hypersensitivity and the arthropathy.