ICD-10 Code D40.11 – Neoplasm of uncertain behavior of right testis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D40.11 – Neoplasm of uncertain behavior of right testis
What it is
This code identifies a mass or growth in the right testis whose behavior is uncertain. It means the pathology or clinical picture does not clearly show benign or malignant behavior.
Clinical signs
Patients may present with a painless testicular lump, swelling, or a feeling of heaviness. Clinical features vary; refer to documentation and pathology findings.
When to use this code
Use D40.11 when the provider documents a neoplasm of uncertain behavior specifically in the right testis. It is appropriate when the lesion has not been confirmed as benign or malignant. Code from the documented anatomic site and laterality.
Do not use for
Do not use this code for clearly benign or malignant testicular tumors. If the documentation does not specify the right testis, check documentation before assigning laterality.
Coding tip
Verify both the uncertainty of behavior and the right-sided site in the record before coding.