ICD-10 Code D05.01 – Lobular carcinoma in situ of right breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D05.01 – Lobular carcinoma in situ of right breast
What it is
D05.01 identifies lobular carcinoma in situ found in the right breast. It means abnormal cells are present within the lobules, but they have not invaded surrounding tissue.
Clinical signs
Clinical features vary; refer to documentation. This diagnosis is often identified on breast biopsy or pathology after an imaging finding or other evaluation, rather than by a distinct palpable mass.
When to use this code
Use D05.01 when the provider documents lobular carcinoma in situ specifically in the right breast. It applies when pathology confirms LCIS and the laterality is clearly right. If the record says only “LCIS” without side, check documentation before coding.
Do not use for
Do not use this code for invasive breast cancer, ductal carcinoma in situ, or LCIS of the left breast. If the site or laterality is unclear, check documentation.
Coding tip
Always verify the pathology report and laterality; right breast must be documented to assign D05.01.