ICD-10 Code C50.219 – Malignant neoplasm of upper-inner quadrant of unspecified female breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C50.219 – Malignant neoplasm of upper-inner quadrant of unspecified female breast
What it is
This code identifies a malignant tumor in the upper-inner quadrant of a female breast when the side is not documented. Use it for breast cancer records that specify this location but do not state left or right.
Clinical signs
Clinical features vary; refer to documentation. Common findings in breast cancer include a palpable breast mass, skin or nipple changes, or imaging and biopsy results confirming malignancy.
When to use this code
Use C50.219 when the provider documents a primary malignant neoplasm in the upper-inner quadrant of a female breast and laterality is missing. It also fits confirmed pathology or oncology notes that name this exact site without specifying left or right.
If the record later clarifies the affected side, code the more specific laterality instead. Check documentation when the note only says “breast cancer” or gives a different quadrant.
Do not use for
Do not use this code for benign breast lesions, metastatic disease to the breast, or cancer in another breast quadrant. If the site or laterality is unclear, check documentation.
Coding tip
Verify both quadrant and laterality in the pathology, imaging, or oncology note before assigning C50.219.