ICD-10 Code D05.8 – Other specified type of carcinoma in situ of breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D05.8 – Other specified type of carcinoma in situ of breast
What it is
D05.8 identifies carcinoma in situ of the breast that is documented as a specified type but does not fit the other listed breast in situ categories. It means abnormal cells are present in the breast ducts or lobules without known invasion.
Clinical signs
Clinical features vary; refer to documentation. This diagnosis is often found on imaging or biopsy, and pathology may describe a noninvasive breast carcinoma with a specific subtype that is not otherwise indexed.
When to use this code
Use D05.8 when the provider documents carcinoma in situ of the breast with a specified type that is not ductal, lobular, or another more specific code. It is appropriate after pathology confirms a noninvasive breast lesion. You should code from the documented histology, not from suspicion alone.
Do not use for
Do not use this code for invasive breast cancer or for unspecified breast carcinoma in situ. If the record identifies a more specific in situ type, code that option instead.
Coding tip
Check the pathology report for the exact subtype before assigning D05.8.