Hydroxyapatite deposition disease, unspecified shoulder

This code describes a condition characterized by the abnormal deposition of calcium hydroxyapatite crystals within the soft tissues of the shoulder joint, leading to pain and restricted movement. It is a form of crystal arthropathy, distinct from gout or pseudogout, and often affects tendons, particularly the rotator cuff.

Use this code when documentation clearly indicates a diagnosis of hydroxyapatite deposition disease affecting the shoulder, and the specific shoulder (left or right) is not specified. This diagnosis is typically supported by imaging studies (e.g., X-ray, ultrasound) showing calcifications, along with clinical symptoms.

• Ensure the documentation explicitly states "hydroxyapatite deposition disease" or "calcific tendinitis" of the shoulder.
• If the specific shoulder is documented (left or right), use the more specific codes M11.011 or M11.012.
• Do not confuse with other forms of crystal arthropathy; confirm the crystal type if possible.