ICD-10 Code D48.61 – Neoplasm of uncertain behavior of right breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D48.61 – Neoplasm of uncertain behavior of right breast
What it is
D48.61 identifies a mass or lesion in the right breast whose behavior is uncertain. Use it when the pathology or clinical record does not confirm whether the growth is benign or malignant.
Clinical signs
Clinical features vary; refer to documentation. Patients may present with a palpable breast lump, imaging abnormality, or a lesion requiring biopsy or close follow-up because its nature is not yet established.
When to use this code
Use this code when the provider documents a right breast lesion, mass, or tumor of uncertain behavior. It is appropriate when pathology, imaging, or clinical assessment cannot classify the finding as benign or malignant. Check documentation if the side or behavior is unclear.
Do not use for
Do not use D48.61 for confirmed benign or malignant breast neoplasms, or for unspecified breast masses without documentation of uncertain behavior. Check documentation if the record only says “breast lump” or “abnormal imaging.”
Coding tip
Verify laterality and the exact wording of the pathology or assessment before assigning D48.61.