Page kidney

This code represents a "page kidney," a rare condition where extrinsic compression of the renal parenchyma, typically by a subcapsular hematoma or fluid collection, leads to renal ischemia and hypertension. The compression reduces renal blood flow, activating the renin-angiotensin-aldosterone system.

Use this code when documentation explicitly states "page kidney" or describes a subcapsular renal compression causing secondary hypertension or renal dysfunction. This condition is often a sequela of trauma, renal biopsy, or spontaneous hemorrhage.

• Ensure documentation clearly links the renal compression to the term "page kidney" or its clinical manifestations.
• Code any underlying cause of the subcapsular collection (e.g., trauma, hemorrhage) in addition to N26.2.
• Consider coding secondary hypertension (I15.0) if documented as a result of the page kidney.