ICD-10 Code D04.5 – Carcinoma in situ of skin of trunk (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D04.5 – Carcinoma in situ of skin of trunk
What it is
D04.5 identifies carcinoma in situ of the skin on the trunk, meaning abnormal cells are confined to the epidermis and have not invaded deeper tissue. Use this code when the record specifies a noninvasive skin cancer on the trunk.
Clinical signs
Clinical features vary; refer to documentation. Typical records may describe a suspicious or biopsy-proven skin lesion on the chest, back, abdomen, or other trunk site, with pathology confirming carcinoma in situ.
When to use this code
Use D04.5 when the provider documents carcinoma in situ of skin specifically located on the trunk. It is appropriate for confirmed in situ lesions after biopsy or excision when the site is the trunk and no invasion is reported. Check documentation if the lesion site is described more broadly or by another anatomic area.
Do not use for
Do not use this code for invasive skin cancer, uncertain behavior, or lesions on the face, scalp, limbs, or other non-trunk sites. If the pathology does not confirm in situ disease, check documentation.
Coding tip
Verify both the histology and the exact anatomic site before assigning D04.5.