In simple words: Polyarteritis nodosa is a disease where small and medium-sized arteries become inflamed and damaged. This is due to the body's own immune system attacking these blood vessels. This code also includes other similar conditions.

Inflammation and damage of small and medium arteries, the vessels that carry oxygen-rich blood away from the heart to the rest of the body, occur due to an attack of certain immune cells on these arteries. This category includes other conditions related to the disease polyarteritis nodosa.

Example 1: A 45-year-old male presents with abdominal pain, fatigue, fever, and muscle aches. After a thorough examination, blood tests, and a tissue biopsy, he is diagnosed with polyarteritis nodosa., A 30-year-old female experiences unexplained weight loss, joint pain, and weakness. Following various diagnostic tests, including a biopsy, she is diagnosed with a condition related to polyarteritis nodosa., A patient presents with symptoms suggestive of polyarteritis nodosa, but further investigation reveals a different systemic vasculitis. This code would be used initially, then potentially changed after a definitive diagnosis.

Documentation should include details of the patient's symptoms, physical examination findings, blood test results, biopsy results, and any other relevant diagnostic tests. The specific type of polyarteritis nodosa or related condition should be documented, if known. Details about the affected organ systems should also be noted.