ICD-10 Code D41.10 – Neoplasm of uncertain behavior of unspecified renal pelvis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D41.10 – Neoplasm of uncertain behavior of unspecified renal pelvis
What it is
This code identifies a renal pelvis mass whose behavior cannot be determined as benign or malignant. Use it when the record documents an uncertain neoplasm in the renal pelvis and does not specify laterality.
Clinical signs
Clinical features vary; refer to documentation. Patients may have imaging or endoscopic findings of a renal pelvis lesion, and pathology may not yet confirm whether the growth is benign or malignant.
When to use this code
Use D41.10 when the provider documents a neoplasm of uncertain behavior involving the renal pelvis and no side is identified. It also fits cases awaiting definitive pathology, if the record clearly states uncertain behavior. If laterality is documented, select the more specific code.
Do not use for
Do not use this code for clearly benign or malignant renal pelvis tumors. Also avoid it when the documentation does not support uncertain behavior or when a more specific renal pelvis code is available.
Coding tip
Check the pathology or imaging note for both behavior and laterality before assigning this code.