Other chondrocalcinosis, unspecified ankle and foot

This code signifies a form of crystal deposition arthritis, specifically chondrocalcinosis, affecting an unspecified ankle or foot joint. It indicates the presence of calcium pyrophosphate dihydrate (CPPD) crystals within the cartilage, leading to joint inflammation and degeneration. This condition is distinct from gout, which involves uric acid crystals.

Use this code when documentation specifies chondrocalcinosis in an ankle or foot, but the laterality (right or left) is not recorded. This diagnosis is typically supported by imaging studies (e.g., X-rays showing chondrocalcinosis) and/or synovial fluid analysis confirming CPPD crystals. It is appropriate when the physician's diagnosis explicitly states "other chondrocalcinosis" of the ankle/foot without further specification of the type.

• Avoid using this code if laterality is documented; instead, select a more specific code (M11.271, M11.272).
• Differentiate from gout (M10.-) and other crystal arthropathies; ensure documentation specifies chondrocalcinosis.
• This code is for the unspecified ankle and foot; if a specific joint within the ankle or foot is identified, a more precise code may be available.