ICD-10 Code C63.00 – Malignant neoplasm of unspecified epididymis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C63.00 – Malignant neoplasm of unspecified epididymis
What it is
This code identifies a malignant tumor arising in the epididymis when the exact epididymal site is not documented. Use it for primary cancer of this male reproductive structure when pathology or provider documentation supports malignancy.
Clinical signs
Findings may include a scrotal or epididymal mass, swelling, pain, or asymmetry. Clinical features vary; refer to documentation and confirmed pathology, imaging, or specialist assessment.
When to use this code
Use C63.00 when the record states malignant neoplasm of the epididymis but does not specify the right or left side. It also fits cases where the provider documents epididymal cancer without further anatomic detail. If the site is known, choose the more specific code.
Do not use for
Do not use this code for benign epididymal masses, inflammation, or unspecified scrotal swelling. Do not use it for metastatic disease to the epididymis unless the provider documents a secondary malignant neoplasm.
Coding tip
Review pathology and operative notes carefully; if laterality or primary versus secondary site is documented, code that specificity instead of C63.00.