ICD-10 Code D05.92 – Unspecified type of carcinoma in situ of left breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D05.92 – Unspecified type of carcinoma in situ of left breast
What it is
This code identifies carcinoma in situ confined to the left breast, without a more specific histologic type documented. It means abnormal cells are present, but there is no evidence they have invaded surrounding tissue.
Clinical signs
Clinical features vary; refer to documentation. Diagnosis is usually based on imaging, biopsy, or pathology showing in situ malignant change in the left breast.
When to use this code
Use D05.92 when the record states carcinoma in situ of the left breast and does not specify ductal, lobular, or another subtype. You may also use it when the provider documents an unspecified in situ breast lesion with left-sided laterality clearly identified.
Do not use for
Do not use this code if the pathology specifies a different carcinoma in situ type, or if the lesion is invasive. Check documentation when the site is not clearly the left breast.
Coding tip
Confirm both laterality and in situ status in the pathology or final diagnosis before assigning D05.92.