ICD-10 Code C41.1 – Malignant neoplasm of mandible (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C41.1 – Malignant neoplasm of mandible
What it is
C41.1 identifies a malignant neoplasm arising in the mandible, or lower jaw. Use it when the record documents primary cancer of the mandible, not a metastatic lesion from another site.
Clinical signs
Clinical features vary; refer to documentation. Common findings may include jaw swelling, pain, loosening teeth, or a visible oral mass, but you should code only when the diagnosis is confirmed or clearly stated.
When to use this code
Use C41.1 when the clinician documents malignant tumor of the mandible, including primary bone cancer of the lower jaw. It also applies when pathology, imaging, or specialist notes support that diagnosis. If the site is uncertain, check documentation before assigning the code.
Do not use for
Do not use this code for benign jaw lesions, cysts, or inflammatory conditions. Do not assign it for metastasis to the mandible unless the record specifically identifies a malignant neoplasm of the mandible.
Coding tip
Verify whether the mandible is the primary site and whether the documentation says malignant, metastatic, or uncertain before coding.