ICD-10 Code D05.10 – Intraductal carcinoma in situ of unspecified breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D05.10 – Intraductal carcinoma in situ of unspecified breast
What it is
This code identifies ductal carcinoma in situ (DCIS) of the breast when the record does not specify the right or left breast. It describes a noninvasive breast cancer confined to the milk ducts.
Clinical signs
Clinical features vary; refer to documentation. DCIS is often found on screening mammography, sometimes with microcalcifications, and may have no palpable mass or symptoms.
When to use this code
Use D05.10 when the provider documents intraductal carcinoma in situ and does not identify the affected breast side. It is also appropriate when laterality is not available in the final diagnosis. If the record specifies right or left breast, use the more specific code instead.
Do not use for
Do not use this code for invasive breast carcinoma, lobular carcinoma in situ, or benign breast lesions. Check documentation if the pathology report uses different terminology.
Coding tip
Confirm that the diagnosis is DCIS and that laterality is truly unspecified before assigning D05.10.