ICD-10 Code D05.02 – Lobular carcinoma in situ of left breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D05.02 – Lobular carcinoma in situ of left breast
What it is
D05.02 identifies lobular carcinoma in situ confined to the left breast. It is a noninvasive breast lesion, meaning abnormal cells are present but have not spread beyond the lobules.
Clinical signs
Clinical features vary; refer to documentation. This diagnosis is often found on biopsy or imaging workup, and may have no obvious physical signs.
When to use this code
Use D05.02 when the provider documents lobular carcinoma in situ specifically in the left breast. Code it from pathology or a confirmed clinical diagnosis, not from a suspicious finding alone. If the record does not clearly identify laterality or histology, check documentation.
Do not use for
Do not use this code for ductal carcinoma in situ, invasive breast cancer, or unspecified breast laterality. If the pathology report does not confirm LCIS, check documentation.
Coding tip
Match the code to both histology and left-sided laterality exactly as documented.