ICD-10 Code D41.21 – Neoplasm of uncertain behavior of right ureter (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D41.21 – Neoplasm of uncertain behavior of right ureter
What it is
This code identifies a growth in the right ureter whose behavior is uncertain. It means the lesion is not clearly documented as benign or malignant.
Clinical signs
Clinical features vary; refer to documentation. Patients may have imaging or endoscopic findings showing a ureteral mass, stricture, or obstruction, but the diagnosis depends on the provider’s assessment.
When to use this code
Use D41.21 when the record states a neoplasm of uncertain behavior in the right ureter and the provider has not labeled it malignant or benign. It is appropriate when pathology, imaging, or operative notes support an indeterminate lesion. Do not code based on suspicion alone.
Do not use for
Do not use this code for confirmed malignant ureteral tumors or clearly benign lesions. If the documentation is unclear, check documentation before assigning the code.
Coding tip
Verify laterality and the provider’s final impression, because ureter codes are side-specific and uncertain behavior must be explicitly documented.