Malignant neoplasm of carotid body

This code signifies a primary cancerous tumor originating in the carotid body, a chemoreceptor located at the bifurcation of the common carotid artery. These rare tumors, often paragangliomas, are characterized by uncontrolled cell growth with the potential for local invasion and distant metastasis.

Assign this code when documentation clearly indicates a confirmed malignant neoplasm of the carotid body. This diagnosis is typically established through biopsy and histopathological examination. Use this code for primary malignant tumors, not secondary metastases to the carotid body.

• Differentiate from benign carotid body tumors (paragangliomas), which would be coded differently.
• Ensure documentation specifies "malignant" to support this code; otherwise, a benign or unspecified neoplasm code may be more appropriate.
• Consider sequencing rules if this is a primary site with documented metastases; the primary site is typically coded first.