Giant cell arteritis

This code represents giant cell arteritis (GCA), also known as temporal arteritis, a chronic inflammatory vasculitis primarily affecting large and medium-sized arteries, particularly those branching from the carotid artery. It is characterized by inflammation of the arterial walls, often leading to narrowing or occlusion of the vessel lumen.

Use this code for patients diagnosed with giant cell arteritis, typically presenting with new-onset headache, scalp tenderness, jaw claudication, or visual disturbances. Documentation should clearly indicate a confirmed diagnosis of GCA, often supported by biopsy findings (e.g., temporal artery biopsy) or characteristic clinical features and elevated inflammatory markers.

• Differentiate from other forms of vasculitis; GCA is distinct from polyarteritis nodosa or Takayasu arteritis.
• Ensure documentation specifies the affected arteries if known, though this code is general for GCA.
• Consider sequencing with codes for associated symptoms (e.g., headache, visual loss) or complications (e.g., blindness, stroke) if they are also being treated.