ICD-10 Code D41.11 – Neoplasm of uncertain behavior of right renal pelvis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D41.11 – Neoplasm of uncertain behavior of right renal pelvis
What it is
D41.11 identifies a mass in the right renal pelvis whose behavior is uncertain, meaning the pathology is not clearly benign or malignant. Use it when the record specifies the right renal pelvis and the final nature of the lesion remains undetermined.
Clinical signs
Clinical features vary; refer to documentation. Patients may have hematuria, flank pain, or an incidental imaging finding in the collecting system, but the code itself is based on the documented uncertain neoplasm, not on symptoms alone.
When to use this code
Use D41.11 when the provider documents a neoplasm of uncertain behavior in the right renal pelvis and no more specific malignant, benign, or inflammatory diagnosis is established. It is appropriate for pathology or imaging reports that describe an indeterminate lesion. Check documentation if the site is described differently.
Do not use for
Do not use this code for confirmed malignant tumors, benign renal pelvis lesions, or nonspecific hematuria without a documented neoplasm. If the lesion is in the left renal pelvis or another urinary tract site, code the documented location instead.
Coding tip
Verify the exact anatomic site and the phrase “uncertain behavior” before assigning D41.11.