ICD-10 Code C50.322 – Malignant neoplasm of lower-inner quadrant of left male breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.322 – Malignant neoplasm of lower-inner quadrant of left male breast
What it is
This code identifies a malignant tumor in the lower-inner quadrant of the left male breast. Use it when documentation specifies both the left side and the lower-inner breast location.
Clinical signs
Clinical features may include a palpable breast mass, skin changes, nipple retraction, or axillary lymph node enlargement. Clinical features vary; refer to documentation.
When to use this code
Use C50.322 when the provider documents primary breast cancer in the left male breast and names the lower-inner quadrant. It is appropriate for confirmed malignancy, including cases supported by pathology or clear oncologic assessment. If the site is not stated precisely, check documentation.
Do not use for
Do not use this code for benign breast lumps, in situ lesions, or unspecified breast quadrant cancers. If the record does not confirm malignancy or laterality, check documentation.
Coding tip
Verify both laterality and quadrant in the note before assigning C50.322.