ICD-10 Code D05.81 – Other specified type of carcinoma in situ of right breast (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D05.81 – Other specified type of carcinoma in situ of right breast
What it is
This code identifies carcinoma in situ located in the right breast when the pathology does not fit a more specific in situ breast cancer category. The abnormal cells remain confined to the breast ducts or lobules and have not invaded nearby tissue.
Clinical signs
Clinical features vary; refer to documentation. It is often found on imaging or biopsy rather than by symptoms, and pathology should confirm an in situ malignant process in the right breast.
When to use this code
Use D05.81 when the provider documents carcinoma in situ of the right breast and specifies a type that is not otherwise classified. Use it after pathology or final diagnosis supports in situ disease, not invasive cancer. If the laterality or exact histology is unclear, check documentation before coding.
Do not use for
Do not use this code for invasive breast cancer, benign breast lesions, or carcinoma in situ of the left breast or breast, unspecified. If the record names a more specific in situ type, code that instead.
Coding tip
Confirm both laterality and the “other specified” wording in the pathology or provider note before assigning D05.81.