Hydroxyapatite deposition disease, unspecified hip

This code signifies a condition where calcium hydroxyapatite crystals deposit in the soft tissues surrounding the hip joint, leading to pain, inflammation, and restricted movement. It represents a form of crystal arthropathy affecting the hip, without further specification of laterality.

Assign this code when documentation confirms hydroxyapatite deposition disease affecting the hip, and the specific side (right or left) is not documented or is unknown. This diagnosis is typically supported by imaging studies (e.g., X-rays showing calcifications) and clinical presentation consistent with crystal-induced arthropathy.

• Ensure documentation explicitly states "hydroxyapatite deposition disease" and specifies the hip as the affected joint.
• If laterality is documented (e.g., right hip, left hip), use the more specific codes M11.051 or M11.052.
• Do not confuse with other crystal arthropathies like gout (M10.-) or pseudogout (M11.1-).