Provided herein are methods of treating ANCA-associated vasculitis (AAV) in individuals in need thereof comprising administering a complement component 5a receptor (C5aR) antagonist. Also provided herein are methods of treating a ANCA-associated vasculitis (AAV) with renal involvement in an individual in need thereof comprising administering a complement component 5a receptor (C5aR) antagonist to the individual if the individual exhibits an elevated urinary soluble CD163 (sCD163) to creatinine ratio compared to individuals without AAV. In some embodiments, the complement component 5a receptor (C5aR) antagonist is avacopan.