Malignant neoplasm of left acoustic nerve

This code signifies a cancerous tumor originating in the left acoustic nerve, also known as the vestibulocochlear nerve (cranial nerve VIII). This type of neoplasm, often a schwannoma, can lead to progressive hearing loss, tinnitus, and balance disturbances on the affected side.

Apply this code when documentation explicitly states a malignant neoplasm affecting the left acoustic nerve. This diagnosis is typically confirmed through imaging studies like MRI and often biopsy. Use this code for primary malignant tumors, not metastatic lesions to the acoustic nerve.

• Differentiate from benign acoustic neuromas (schwannomas), which are coded differently.
• Ensure laterality is clearly documented as "left" to support this specific code.
• Consider sequencing this code as the primary diagnosis if it is the reason for the encounter, followed by codes for associated symptoms or complications.