ICD-10 Code D41.02 – Neoplasm of uncertain behavior of left kidney (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D41.02 – Neoplasm of uncertain behavior of left kidney
What it is
This code identifies a kidney mass in the left kidney whose behavior is uncertain, meaning the record does not clearly show whether it is benign or malignant. Use it when documentation supports an indeterminate neoplasm in that organ.
Clinical signs
Clinical features vary; refer to documentation. Imaging or pathology may describe an indeterminate renal lesion, mass, or tumor with uncertain biologic behavior, but the record should not state a definite benign or malignant diagnosis.
When to use this code
Use D41.02 when the provider documents a neoplasm of uncertain behavior specifically in the left kidney. It may apply during workup, surveillance, or after biopsy when the lesion remains classified as uncertain. Code the documented site exactly and do not assume laterality.
Do not use for
Do not use this code for clearly benign or malignant left kidney neoplasms. If the documentation names a renal cyst, infection, or another non-neoplastic condition, choose the more specific diagnosis instead.
Coding tip
Verify the laterality and the phrase “uncertain behavior” in the assessment, impression, or pathology report before assigning D41.02.