In simple words: The doctor drains an abscess from the kidney or the area around the kidney through an open incision.

This procedure involves the open drainage of an abscess located in the kidney (renal) or the area surrounding the kidney (perirenal). The procedure typically involves making an incision, dissecting through the tissues to reach the abscess, draining the pus and debris, and placing drains in the abscess cavity.

Example 1: A patient presents with a complex, multiloculated perirenal abscess that is not amenable to percutaneous drainage. The urologist performs an open drainage of the abscess., A patient with a renal abscess develops sepsis and requires immediate drainage. Due to the patient's unstable condition, an open approach is chosen for faster and more complete drainage., A patient has a large renal abscess with significant surrounding inflammation. Open drainage is performed to allow for thorough debridement of the infected tissue.

Documentation should include details of the abscess location (perirenal or renal), the size and complexity of the abscess, the approach used (open), and the placement of drains. Operative reports should detail the procedure, including incision location, dissection performed, drainage findings, and drain placement. Evidence of medical necessity, such as imaging studies and clinical findings, should also be included.