Unspecified lump in axillary tail of the left breast

This code signifies the presence of an uncharacterized mass or swelling located specifically in the axillary tail (tail of Spence) of the patient's left breast. It indicates that the nature of the lump (e.g., cyst, fibroadenoma, malignancy) has not yet been determined through diagnostic workup.

Use this code when documentation clearly states an unspecified lump is found in the axillary tail of the left breast, and further investigation is pending or has not yielded a definitive diagnosis. It is appropriate for initial encounters where a palpable mass is identified in this specific anatomical location but its etiology is unknown.

• Do not use this code if the lump's nature is specified (e.g., "cyst of left breast, axillary tail").
• Ensure the documentation explicitly states "axillary tail" and "left breast" for accurate coding.
• This code is often a temporary diagnosis, pending further diagnostic studies such as imaging or biopsy.