ICD-10 Code K68.2 – Retroperitoneal fibrosis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K68.2 – Retroperitoneal fibrosis
What it is
K68.2 identifies retroperitoneal fibrosis, a condition where fibrous tissue develops in the retroperitoneal space and may encase nearby structures. Use it when the record documents this diagnosis.
Clinical signs
Clinical features vary; refer to documentation. Commonly, records describe abdominal or back pain, ureteral obstruction, hydronephrosis, or impaired renal function related to the fibrotic process.
When to use this code
Use K68.2 when the provider documents retroperitoneal fibrosis as the confirmed diagnosis. It may also apply when imaging, surgery, or pathology supports the condition and the note clearly links symptoms or obstruction to the fibrosis.
Code it for idiopathic or secondary retroperitoneal fibrosis if the chart uses this diagnosis. If the record only mentions a mass, obstruction, or flank pain without confirmation, check documentation before assigning the code.
Do not use for
Do not use K68.2 for nonspecific retroperitoneal mass, abdominal pain, or ureteral obstruction without documented fibrosis. Check documentation if the cause is another retroperitoneal disease.
Coding tip
Look for explicit provider wording such as “retroperitoneal fibrosis” or “RPF” before coding.