Familial chondrocalcinosis, unspecified ankle and foot

This code describes a genetic disorder characterized by the deposition of calcium pyrophosphate crystals in the cartilage of the ankle and foot joints, leading to inflammation and degenerative changes. It represents a hereditary form of chondrocalcinosis affecting these specific lower extremity sites.

Use this code when documentation confirms a diagnosis of familial chondrocalcinosis affecting an unspecified ankle or foot. This diagnosis is typically supported by a patient's family history of the condition, characteristic radiographic findings (e.g., chondrocalcinosis), and clinical symptoms such as joint pain, swelling, and stiffness in the ankle or foot.

• Ensure documentation specifies "familial" to differentiate from idiopathic or secondary chondrocalcinosis.
• If the specific ankle (right or left) or foot (right or left) is documented, use a more specific code from the M11.17- subcategory.
• Code any associated osteoarthritis or other joint pathologies separately, if documented.