ICD-10 Code D40 – Neoplasm of uncertain behavior of male genital organs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D40 – Neoplasm of uncertain behavior of male genital organs
What it is
D40 identifies a growth in male genital organs whose behavior cannot be determined as clearly benign or malignant. Use it when the pathology or clinical record states uncertain behavior and the site is within the male genital tract.
Clinical signs
Clinical features vary; refer to documentation. Findings may include a localized mass, abnormal imaging, or tissue sampled for evaluation when the lesion’s biologic behavior remains uncertain.
When to use this code
Use D40 when the provider documents a neoplasm of uncertain behavior involving a male genital organ and no more specific code is available. Confirm the exact anatomic site from the record, such as testis, prostate, penis, or other male genital structure.
If the diagnosis is based on pathology, code the documented uncertain behavior rather than assuming malignancy or benignity. When the site or behavior is unclear, check documentation before assigning the code.
Do not use for
Do not use D40 for clearly benign lesions, confirmed malignant neoplasms, or inflammatory conditions. Check documentation if the record does not explicitly describe uncertain behavior.
Coding tip
Always code the documented site precisely, because D40 is site-specific within male genital organs.