Malignant neoplasm of branchial cleft

This code signifies a cancerous tumor originating from the branchial cleft, which are embryonic structures in the neck that typically disappear before birth. These neoplasms are a rare type of head and neck cancer, often presenting as a mass in the lateral neck.

Apply this code for confirmed diagnoses of primary malignant neoplasms arising from branchial cleft remnants. Documentation should clearly state "malignant neoplasm of branchial cleft" or similar terminology, supported by pathology reports confirming malignancy and origin.

• Ensure the pathology report specifies malignancy; otherwise, consider codes for benign or unspecified neoplasms of the branchial cleft.
• Distinguish this from other primary or metastatic neck malignancies; the origin must be explicitly stated as branchial cleft.
• Sequence this code as the primary diagnosis when it is the reason for the encounter, followed by any associated signs, symptoms, or complications.