ICD-10 Code C63.0 – Malignant neoplasm of epididymis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C63.0 – Malignant neoplasm of epididymis
What it is
This code identifies a malignant tumor arising in the epididymis, the coiled tube behind the testis that stores and transports sperm. Use it when documentation clearly states primary cancer of the epididymis.
Clinical signs
Clinical features vary; refer to documentation. Reported findings may include a scrotal or paratesticular mass, swelling, pain, or incidental imaging detection, but confirmation depends on the clinician’s diagnosis.
When to use this code
Use C63.0 when the record documents malignant neoplasm of the epididymis as the diagnosis, including pathology or specialist notes. Apply it for newly diagnosed, active, or evaluated cancer of this site. If the note only says “testicular mass” or “scrotal tumor,” check documentation before coding.
Do not use for
Do not use this code for benign epididymal lesions, infection, or nonspecific scrotal pain. If the cancer is described as involving the testis, spermatic cord, or another genital site, confirm the exact primary location.
Coding tip
Verify the anatomic site in pathology or operative documentation before assigning C63.0.