Summary & Overview
HCPCS S2235: Implantation of Auditory Brain Stem Implant
HCPCS Level II code S2235 represents the surgical implantation of an auditory brain stem implant, a specialized neurotologic procedure used to provide auditory perception for patients who are not candidates for standard cochlear implants. Nationally, this code is relevant for tertiary care centers and specialized surgical programs that manage complex hearing loss due to neural or anatomic contraindications to cochlear implantation. The procedure is resource-intensive, involves multidisciplinary perioperative care, and has implications for coverage and network planning because it is uncommon and concentrated in specialized centers.
Key payers referenced in this analysis include Aetna, Blue Cross Blue Shield, Cigna Health, UnitedHealthcare, and Medicare. Readers will find a concise overview of coverage patterns and payer inclusion, clinical context for when an auditory brain stem implant is used, and benchmarking elements where available. The publication outlines typical sites of service and what to expect on the billing/service line for this procedure. Data not available in the input for some benchmarking fields is noted where appropriate.
This summary aims to orient clinicians, coding professionals, and policy staff to the clinical purpose and payer landscape for S2235, and to identify the primary topics covered in the full publication: coverage scope, clinical indications, and administrative considerations for implanting centers.
Billing Code Overview
HCPCS Level II code S2235 describes the implantation of an auditory brain stem implant. This procedure involves surgical placement of an implanted device designed to provide auditory sensation by directly stimulating the cochlear nucleus or auditory brainstem pathways when conventional cochlear implants are not appropriate.
Service type: Surgical implantation of neurotologic auditory prosthesis
Typical site of service: Operating room in an acute care hospital or specialized tertiary care center with otologic/neurotologic surgical capabilities
Clinical & Coding Specifications
Clinical Context
A typical patient is an adult or adolescent with severe sensorineural hearing loss or neurofibromatosis type II with bilateral cochlear nerve deficiency who is not a candidate for conventional cochlear implantation. The workflow begins with multidisciplinary evaluation by otology/neurotology and audiology including diagnostic audiometry, speech perception testing, MRI of the internal auditory canals and brainstem, and counseling about risks and expected outcomes. Preoperative planning includes assessment of medical comorbidities, anesthesia evaluation, and selection of implant side. The surgical encounter is performed in an operating room under general anesthesia by a neurotologist or neurosurgeon with intraoperative neurophysiologic monitoring. The procedure involves craniotomy or retrosigmoid approach, placement of the auditory brain stem implant electrode array on the cochlear nucleus, securement of the internal receiver-stimulator, and closure. Postoperative care includes recovery in PACU, short inpatient observation for neurologic monitoring, wound care, pain control, and imaging as indicated. Initial activation and programming of the external processor and mapping by audiology typically occur 2–6 weeks postoperatively, followed by serial auditory rehabilitation and speech therapy visits for mapping adjustments and outcomes assessment.
Coding Specifications
| Modifier | Description | When to Use |
|---|---|---|
22 | Increased procedural services | Use when work required is substantially greater than typically required for (document justification and additional work). |