M31.0: Hypersensitivity angiitis

Blood vessels transport the blood from the heart to the different tissues and organs in the body, and back again. In so doing, they provide the tissue and organs with oxygen and nutrients, and remove waste substances. With this disorder, your immune system attacks the body’s own blood vessels. The immune system protects the body from pathogens and foreign substances. The immune system can also destroy cells in the body that have pathologically changed. If the immune system attacks the body’s own blood vessels, those blood vessels can become inflamed. When blood vessels in the skin are affected, patches of the skin may turn red or swell up. Blood vessels in the internal organs such as the kidneys and lungs can also be affected.

There are many possible causes for this condition. Possible causes include medication, pathogens, or a disorder of the defense system, for example.

Patient Disclaimer

The information provided on this page is for general educational purposes only. It is not intended for self-diagnosis and does not replace professional medical advice. Always consult your doctor or a qualified healthcare provider with any questions or concerns about your health.

If you see an ICD diagnosis code (e.g., on a medical report), be aware that doctors may also include additional indicators to express diagnostic certainty. Only a healthcare professional can interpret these codes accurately in the context of your individual case.

For a complete understanding of your condition and what the diagnosis means for you, please speak directly with your doctor.