ICD-11 classes
15 Diseases of the musculoskeletal system or connective...
Arthropathies
Inflammatory arthropathies
FA26 — Certain specified crystal arthropathies
FA26.1 — Hydroxyapatite deposition disease

ICD-11 FA26.1 — Hydroxyapatite deposition disease

Calcium hydroxyapatite crystal deposition disease is characterised by the presence of basic calcium phosphate crystals — predominantly hydroxyapatite — in periarticular soft tissues, especially tendons. This entity is best recognised as «calcific tendinitis» at its most frequent site about the shoulder, but the disease involves numerous other sites and may be more appropriately termed calcific periarthritis.

The diagnosis includes nothing.

The diagnosis excludes nothing.

It has no clarifying diagnoses.