ICD-10 Code C50.229 – Malignant neoplasm of upper-inner quadrant of unspecified male breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.229 – Malignant neoplasm of upper-inner quadrant of unspecified male breast
What it is
This code identifies a malignant breast tumor in the upper-inner quadrant of a male breast when laterality is not documented. Use it for a confirmed cancer diagnosis, not for a suspected mass.
Clinical signs
Findings may include a palpable breast mass, nipple changes, skin dimpling, or local tenderness. Clinical features vary; refer to documentation and pathology or imaging confirmation.
When to use this code
Use C50.229 when the record clearly states malignant neoplasm of the upper-inner quadrant and does not specify right or left breast. It is appropriate after diagnostic workup confirms malignancy. If the note only says “breast cancer” without quadrant detail, check documentation.
Do not use for
Do not use this code for benign breast lesions, suspected cancer, or carcinoma in situ. If the breast laterality is documented, choose the more specific code instead.
Coding tip
Verify both quadrant and laterality in the pathology, operative, or oncology note before assigning this code.