ICD-9 Diagnosis Code 446.20

Hypersensit angiitis NOS

Diagnosis Code 446.20

ICD-9: 446.20
Short Description: Hypersensit angiitis NOS
Long Description: Hypersensitivity angiitis, unspecified
This is the 2014 version of the ICD-9-CM diagnosis code 446.20

Code Classification
  • Diseases of the circulatory system
    • Diseases of arteries, arterioles, and capillaries (440-449)
      • 446 Polyarteritis nodosa and allied conditions

Information for Medical Professionals

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Index of Diseases and Injuries
References found for the code 446.20 in the Index of Diseases and Injuries:

Information for Patients


Also called: Angiitis

Vasculitis is an inflammation of the blood vessels. It happens when the body's immune system attacks the blood vessel by mistake. It can happen because of an infection, a medicine, or another disease. The cause is often unknown.

Vasculitis can affect arteries, veins and capillaries. Arteries are vessels that carry blood from the heart to the body's organs. Veins are the vessels that carry blood back to the heart. Capillaries are tiny blood vessels that connect the small arteries and veins.

When a blood vessel becomes inflamed, it can

  • Narrow, making it more difficult for blood to get through
  • Close off completely so that blood can't get through
  • Stretch and weaken so much that it bulges. The bulge is called an aneurysm. If it bursts, it can cause dangerous bleeding inside the body.

Symptoms of vasculitis can vary, but usually include fever, swelling and a general sense of feeling ill. The main goal of treatment is to stop the inflammation. Steroids and other medicines to stop inflammation are often helpful.

NIH: National Heart, Lung, and Blood Institute

  • Allergic vasculitis
  • Aortic angiography
  • Cerebral angiography
  • Henoch-Schonlein purpura
  • Necrotizing vasculitis
  • Polyarteritis nodosa
  • Takayasu arteritis

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