Skeletal fluorosis, unspecified ankle and foot

This code signifies a diagnosis of skeletal fluorosis affecting an unspecified ankle and foot. Skeletal fluorosis is a chronic metabolic bone disease caused by excessive intake of fluoride, leading to abnormal bone formation, increased bone density, and potential joint pain and stiffness.

Use this code when documentation confirms skeletal fluorosis impacting the ankle and/or foot, but the specific laterality (right or left) is not specified. This diagnosis is typically supported by a history of chronic fluoride exposure, radiographic findings (e.g., osteosclerosis, calcification of ligaments), and clinical symptoms.

• Avoid using this code if the laterality of the affected ankle/foot is documented; instead, select a more specific code (M85.171, M85.172, M85.173).
• Ensure documentation clearly links the skeletal fluorosis to the ankle and/or foot region.
• Consider sequencing this code after codes for the underlying cause of fluoride exposure, if known and relevant.