Hydroxyapatite deposition disease, right knee

This code represents a form of crystal deposition arthropathy affecting the right knee, characterized by the accumulation of hydroxyapatite crystals in and around the joint. This deposition can lead to inflammation, pain, and functional impairment of the knee joint. It is distinct from other crystal-induced arthropathies like gout or pseudogout.

Use this code when documentation explicitly states a diagnosis of hydroxyapatite deposition disease (HADD) or calcific periarthritis specifically affecting the right knee. Supporting documentation should include imaging findings (e.g., radiographs showing calcification) and/or clinical presentation consistent with crystal deposition.

• Ensure the laterality (right knee) is clearly documented and matches the code.
• Differentiate from other crystal arthropathies (e.g., M10.- for gout, M11.1- for chondrocalcinosis) based on crystal type or specific diagnosis.
• Code any associated symptoms or complications, such as pain or effusion, separately if documented.