ICD-10 Code C50.622 – Malignant neoplasm of axillary tail of left male breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.622 – Malignant neoplasm of axillary tail of left male breast
What it is
This code identifies a malignant tumor arising in the axillary tail of the left male breast. Use it when documentation specifies this exact breast subsite and laterality.
Clinical signs
Clinical features vary; refer to documentation. Common findings include a palpable breast or axillary-tail mass, localized swelling, skin change, or abnormal imaging and biopsy results confirming malignancy.
When to use this code
Use C50.622 when the provider documents primary cancer in the left male breast’s axillary tail, including pathology-confirmed breast carcinoma at that site. It also fits when the record clearly states “axillary tail of left male breast” or equivalent wording. If the site or laterality is unclear, check documentation before coding.
Do not use for
Do not use this code for benign breast masses, unspecified breast cancer, or malignancy in another breast quadrant or the axilla itself. Check documentation if the lesion is metastatic rather than a primary breast tumor.
Coding tip
Code the exact anatomic site and laterality only when the provider documents both clearly.