S04.62XA Injury of acoustic nerve, left side, initial encounter

ICD-10-CM Code S04.62XA: Injury of acoustic nerve, left side, initial encounter

ICD-10-CM code S04.62XA represents an injury of the acoustic nerve on the left side during an initial encounter. This specific diagnosis code is listed within official state injury coding indexes and federal Medicare billing articles. The available sources confirm the code's description and its structural variations for different patient encounters, but they do not provide detailed clinical treatment guidelines for this specific diagnosis. 3 4

Plain-language overview

The code S04.62XA translates directly to an injury of the acoustic nerve on the left side, specifically noting that this is an initial encounter for the condition. This plain-language description is explicitly provided in official coding documentation. 3

What this code represents

S04.62XA is a specific diagnosis code listed within an official state public health index for head and spinal cord injuries. It is grouped alongside other cranial nerve injuries, such as those affecting the facial or oculomotor nerves on the left side. 3

Coding details

The official coding structure for a left acoustic nerve injury includes distinct codes for the initial encounter, subsequent encounter, and sequela. These variations are identified in a Medicare billing article as S04.62XA, S04.62XD, and S04.62XS, respectively. 4

Coverage and utilization context

The code S04.62XA appears in a Medicare billing and coding article concerning neurophysiology evoked potentials. The inclusion of this code in a federal billing article provides operational context, but the sources do not establish that this code guarantees payment or coverage. 4

What the sources add

The state public health source provides a categorical list of cranial nerve injuries, while the federal Medicare source places the exact code into a billing context for neurophysiology services. Together, these sources establish the official description and administrative utilization of the code. 3 4

Clinical context

Clinical literature discusses vestibular schwannoma, a tumor associated with the acoustic nerve, noting that surgical management carries a risk of facial nerve injury. These clinical guidelines detail anatomical approaches and nerve preservation, but do not explicitly reference the S04.62XA diagnosis code. 1 2

Documentation considerations

The official code description explicitly designates the left side and the initial encounter. The available coding sources establish these specific parameters, but they do not provide further instructions on the clinical documentation needed to support the use of this code. 3 4

Sources

1. EANO guideline on the diagnosis and treatment of vestibular schwannoma — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Clinical Studies and Pre-clinical Animal Models on Facial Nerve Preservation, Reconstruction, and Regeneration Following Cerebellopontine Angle Tumor Surgery–A Systematic Review and Future Perspectives — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
3. Head and Spinal Cord ICD-10 Inclusion Codes — dph.illinois.gov; accessed 2026-07-25.
4. Article - Billing and Coding: Neurophysiology Evoked Potentials (NEPs) (A56773) — cms.gov; accessed 2026-07-25.