Hydroxyapatite deposition disease, left ankle and foot

This code signifies a diagnosis of hydroxyapatite deposition disease (HADD) affecting the left ankle and foot. HADD is a condition characterized by the abnormal deposition of calcium hydroxyapatite crystals in soft tissues, often leading to pain, inflammation, and impaired joint function.

Apply this code when documentation explicitly states HADD involving the left ankle and/or foot. This typically occurs in patients presenting with localized pain, swelling, and tenderness in the specified anatomical region, confirmed by imaging studies showing calcific deposits.

• Ensure documentation specifies "left" ankle and foot; laterality is crucial for accurate coding.
• Do not confuse HADD with other crystal deposition diseases like gout or pseudogout; confirm the specific crystal type.
• Code any associated pain (e.g., M25.572 for pain in left ankle and foot) as a secondary diagnosis if documented.