ICD-10 Code D04.3 – Carcinoma in situ of skin of other and unspecified parts of face (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code D04.3 – Carcinoma in situ of skin of other and unspecified parts of face
What it is
D04.3 identifies carcinoma in situ, meaning abnormal skin cells confined to the epidermis on other or unspecified parts of the face. Use it when the lesion is documented as noninvasive and located on facial skin not covered by a more specific code.
Clinical signs
Clinical features vary; refer to documentation. Typical records describe a suspicious facial skin lesion confirmed by pathology as in situ, with no invasion into deeper tissue.
When to use this code
Use this code when the provider documents carcinoma in situ of facial skin and the site is described as other or unspecified parts of the face. It may also apply when pathology confirms in situ disease but the note does not specify a more exact facial subsite. Check documentation for laterality or a more specific site before assigning this code.
Do not use for
Do not use D04.3 for invasive skin cancer, benign lesions, or carcinoma in situ at a different anatomic site. If the record identifies a more specific facial location, code that site instead.
Coding tip
Verify that the documentation says “in situ” and that the facial site is not more specifically named before selecting D04.3.