ICD-10 Code D40.8 – Neoplasm of uncertain behavior of other specified male genital organs (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D40.8 – Neoplasm of uncertain behavior of other specified male genital organs
What it is
D40.8 identifies a growth in a male genital organ that cannot be clearly labeled benign or malignant. Use it when documentation names an uncertain-behavior neoplasm in a specified male genital site not covered by a more specific code.
Clinical signs
Clinical features vary; refer to documentation. The record may describe a mass, enlargement, lesion, or abnormal imaging finding, but the final diagnosis must indicate uncertain behavior rather than confirmed cancer or a benign lesion.
When to use this code
Use this code when the provider documents a neoplasm of uncertain behavior in an “other specified” male genital organ and no more specific ICD-10 code applies. It is appropriate for pathology or surgical notes that state uncertain or borderline behavior. Check documentation if the site is unclear.
Do not use for
Do not use D40.8 for confirmed malignant neoplasms, benign tumors, or nonspecific symptoms without a documented neoplasm. If the organ site is coded elsewhere or the behavior is not stated, check documentation.
Coding tip
Match the exact organ and behavior wording in the record before assigning D40.8.