ICD-10 Code C76.8 – Malignant neoplasm of other specified ill-defined sites (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code C76.8 – Malignant neoplasm of other specified ill-defined sites
What it is
C76.8 identifies a malignant neoplasm arising in an ill-defined or poorly specified anatomic site not described by a more exact code. Use it when the record names a malignant tumor, but the primary location is not otherwise classifiable.
Clinical signs
Clinical features vary; refer to documentation. Findings usually reflect a malignant mass or infiltrative lesion, but the chart should support the diagnosis and the unspecified anatomic site.
When to use this code
Use C76.8 when the provider documents a primary malignant neoplasm in an other specified ill-defined site and no more specific site code is available. It is appropriate when pathology, imaging, or the final assessment confirms malignancy, but the exact location remains inadequately defined. Check documentation if the site can be coded more precisely.
Do not use for
Do not use this code when the tumor site is known and a more specific ICD-10-CM code exists. Do not use it for metastatic disease, secondary malignant neoplasms, or benign or in situ lesions.
Coding tip
Query for the exact primary site before assigning C76.8, because a more specific location code often applies.