The scope of this page is cochlear implantation across the life span.
See the Treatment sections of the Hearing Loss (Newborn) Evidence Map, the Hearing Loss (Early Childhood) Evidence Map, the Hearing Loss (School-Age) Evidence Map, and the Hearing Loss (Adults) Evidence Map, as well as the Language and Communication of Deaf and Hard of Hearing (DHH) Individuals Evidence Map for summaries of the available research on this topic.
Hearing-related terminology may vary depending upon context and a range of factors. See the ASHA resource on hearing-related topics: terminology guidance for more information.
A cochlear implant (CI) is a surgically implanted, electronic device that effectively bypasses damaged inner ear hair cells and provides stimulation directly to the auditory nerve. The auditory nerve sends a signal to the brain where it is interpreted as sound. A CI consists of two components: an implanted device and an external sound processor. Microphones on the externally worn processor collect sounds that are converted into electric signals. The processor shares the signals with the internal device, where they are translated into electric pulses to be delivered to various electrodes according to their location in the cochlea. The electric pulses stimulate the auditory nerve and are perceived as sound. As of December 2019, it was estimated that, in the United States, approximately 65,000 devices have been implanted in children and 118,100 devices have been implanted in adults, with an estimated 1 million devices implanted worldwide (National Institute on Deafness and Other Communication Disorders, 2024; Zeng, 2022).
In addition to the patient and their caregivers/care partners (including family members), an interprofessional CI team may include an audiologist, an otolaryngologist/neurotologist (i.e., implant surgeon), a speech-language pathologist (SLP), a pediatrician/primary care physician, a mental health professional, a developmental specialist, an educator, a vocational counselor, and/or a social worker. Interprofessional teams provide high-quality comprehensive care by integrating different professional perspectives and backgrounds. Depending on the specific situation, a patient may see a combination of service providers, both inside and outside of a CI center. For example, a patient may see one audiologist and SLP at the CI center and another audiologist and SLP at school or one audiologist for hearing aid care and a different audiologist for CI care. A collaborative, interprofessional CI team will engage in group decision making regarding the patient’s plan of care. This includes the development of a follow-up plan with ongoing communication and information sharing. See the ASHA resource on interprofessional education/interprofessional practice (IPE/IPP) for more information.
The patient and their caregivers/care partners are an integral part of the care team. Family-centered practice is a key component in providing comprehensive services to people who are deaf and hard of hearing. An international panel of experts has described the guiding principles of family-centered early intervention for children who are deaf and hard of hearing, which include partnership between families and professionals, informed decision making, and access to support services (Moeller et al., 2013). See the ASHA resources on focusing care on individuals and their care partners and health literacy for more information.
Audiologists play a primary role within a collaborative, interprofessional cochlear implant (CI) team throughout the assessment and (re)habilitation process. Professional roles and activities in audiology include clinical services (diagnosis, assessment, planning, and treatment); prevention and advocacy; and education, administration, and research. See ASHA’s Scope of Practice in Audiology (ASHA, 2018).
The following roles and responsibilities are appropriate for audiologists:
Education and Advocacy
Screening and Assessment
Intervention and Support
As indicated in ASHA’s Code of Ethics (ASHA, 2023), audiologists who serve this population should be specifically educated and appropriately trained to do so. Roles may vary depending on patient factors and specifics of the CI team.
Speech-language pathologists (SLPs) play a central role within a collaborative, interprofessional CI team throughout the assessment and (re)habilitation process. Professional roles and activities in speech-language pathology include clinical services (diagnosis, assessment, planning, and treatment); prevention and advocacy; and education, administration, and research. See ASHA’s Scope of Practice in Speech-Language Pathology (ASHA, 2016).
The following roles and responsibilities are appropriate for SLPs:
Education and Advocacy
Screening and Assessment
Intervention and Support
As indicated in ASHA’s Code of Ethics (ASHA, 2023), SLPs who serve this population should be specifically educated and appropriately trained to do so. Roles may vary depending on patient factors and specifics of the CI team.
See the Assessment sections of the following evidence maps for pertinent scientific evidence, expert opinion, and client/caregiver perspective: Hearing Loss (Newborn) Evidence Map, Hearing Loss (Early Childhood) Evidence Map, Hearing Loss (School-Age) Evidence Map, and Hearing Loss (Adults) Evidence Map. For more information, see the Language and Communication of Deaf and Hard of Hearing (DHH) Individuals Evidence Map.
For guidance and considerations on infection control practices during the assessment process, see the ASHA page on infection control resources for audiologists and speech-language pathologists.
A comprehensive assessment for cochlear implantation includes several components. Candidacy determination, counseling, and device selection are all part of the assessment process. The interprofessional CI team develops a coordinated assessment plan for cochlear implantation that requires input from the patient and/or their caregivers/care partners as well as from various professionals. Input from each team member and results from related assessments contribute to candidacy determination. The team provides an explanation of assessment results and individualized expectations of cochlear implantation to the patient and/or their caregivers/care partners to assist with informed decision making.
See ASHA’s resource on interprofessional education/interprofessional practice (IPE/IPP) and the ASHA Practice Portal pages on Counseling in Audiology and Speech-Language Pathology and Language and Communication of Deaf and Hard of Hearing Children for more information.
Determining CI candidacy is a complex and variable process. Beyond the assessment of auditory function, consideration is given to medical status, potential communication benefit, and support systems and services. Patient and/or caregiver/care partner expectations for cochlear implantation are discussed, and counseling is provided based upon these expectations. The result of this process is the determination of an individual’s candidacy for cochlear implantation.
See the ASHA Practice Portal page on Cultural Responsiveness for information on including and responding to cultural variables and dimensions of diversity that a person brings to the table, including their impact on choices and preferences regarding the assessment process and treatment options. Cultural diversity can incorporate factors such as age, disability, ethnicity, gender identity, national origin, race, religion, sex, sexual orientation, and veteran status. Linguistic diversity is another factor to consider (ASHA, 2017).
Candidacy criteria for cochlear implantation have evolved over time (Warner-Czyz et al., 2022; Zeitler et al., 2024; Zombek & Wolfe, 2023; Zwolan & Basura, 2021). Early identification of hearing loss, through universal newborn hearing screening in the United States, contributes to children now being implanted as young as 9 months of age. See the ASHA Practice Portal page on Newborn Hearing Screening. In adults, age is not a contraindication, and cochlear implantation in older adults has been shown to have positive outcomes (Carlson et al., 2010; Dillon et al., 2013; Hilly et al., 2016; Knopke et al., 2016; Lin et al., 2012; Mosnier et al., 2015; Noble et al., 2009; Olze et al., 2012, 2016; Zwolan et al., 2014). CI candidates may include children and adults with prelingual deafness, children and adults who receive little to no benefit from hearing aids, or children and adults who suddenly lose their hearing in one or both ears. In the United States, potential pediatric candidates receive CIs at a higher rate than potential adult candidates (Nassiri et al., 2023a, 2023b).
There are established guidelines for both adults and children that specify the materials and conditions necessary to assess eligibility for CIs (Dunn et al., 2024; Park et al., 2022; Warner-Czyz et al., 2022).
The U.S. Food and Drug Administration (FDA) approves CIs for use based on safety and effectiveness. Approvals are device specific, and devices are approved for specific ages. It is not uncommon for patients to undergo “off-label” CI surgery (Carlson et al., 2018), which refers to the use of CIs for indications outside of the current FDA-approved candidacy criteria. This occurs when professional experience and increasing knowledge lead to evolving practices and expanded indications that are not reflected or included in FDA labeling. Clinical trials may also lead to expanded FDA indications. See U.S. Food & Drug Administration: Cochlear Implants and Centers for Medicare & Medicaid Services: Cochlear Implantation for additional information.
Information contributing to candidacy determination for cochlear implantation is collected in a patient-centered manner and from a variety of sources and professionals.
Case History
A comprehensive case history for a cochlear implantation candidate may include the following items:
For more information regarding gathering a case history, see the ASHA Practice Portal page on Cultural Responsiveness.
Otology
An otologist/neurotologist may provide information on
Medical/Primary Care
A primary care physician may provide information on
Audiology
The audiologic assessment may vary depending on the individual patient’s age and their language and cognitive abilities. Ideally, a comprehensive audiologic assessment is performed. Refer to the Assessment sections of the ASHA Practice Portal pages on Hearing Loss in Children and Hearing Loss in Adults for more information on comprehensive audiologic assessment.
An audiologist may provide information on the following factors:
Speech-Language Pathology
An SLP may provide information on the following factors:
Psychology
A psychologist may provide information on
Educational Support
An educator may provide information on
Social Support
A social worker may provide information on
Patient and Family
The patient and/or their family/caregivers/care partners may provide information on
Comprehensive assessment results as well as patient and caregiver/care partner input are compiled and considered by the CI team when determining whether a patient is a candidate for cochlear implantation. If a joint decision is made to proceed with cochlear implantation, then the CI team will initiate discussions with the patient and/or their caregivers/care partners related to CI selection, surgery, follow-up, programming, and (re)habilitation. If, for any reason, the decision is to not proceed with cochlear implantation, then discussions will occur as to other aural (re)habilitation options that can be explored to optimize patient communication and participation.
The World Health Organization (2001) published the International Classification of Functioning, Disability and Health as a classification of health and disability based upon functional status. This classification system can be used to assist clinicians in patient care management, both in establishing goals and in determining specific outcomes that can be measured through patient report.
Selection of a CI involves consideration of medical and audiologic factors, center offerings, patient and/or caregiver/care partner input, and comparison of the available device components and features.
Patients and/or their caregivers/care partners can choose from different processor styles, depending on the device manufacturer. The manufacturer of the device selected will also be used for the external equipment. Device selection may include consideration of features that provide improved sound quality and hearing in noise. Examples of such features include
See the Treatment sections of the following evidence maps for pertinent scientific evidence, expert opinion, and client/caregiver perspective: Hearing Loss (Newborn) Evidence Map, Hearing Loss (Early Childhood) Evidence Map, Hearing Loss (School-Age) Evidence Map, and Hearing Loss (Adults) Evidence Map. For more information, see the Language and Communication of Deaf and Hard of Hearing (DHH) Individuals Evidence Map.
For guidance and considerations on infection control practices during the treatment process, see the ASHA page on infection control resources for audiologists and speech-language pathologists.
All CI care is patient- and family-centered. The CI team works interprofessionally to determine the best treatment options for the patient. In addition, the team will educate and counsel a recipient and/or their caregivers/care partners about device options, surgical implantation procedures, postsurgical care, audiologic management of the device(s), future processor upgrade, aural (re)habilitation, outcome expectations, and caregiver/care partner involvement in the treatment process.
See ASHA’s resource on interprofessional education/interprofessional practice (IPE/IPP).
Prior to surgery, the surgeon will discuss the procedure as well as possible risks and complications with the patient and/or their family/caregivers/care partners (e.g., the possibility of reimplantation at a future date).
The surgical procedure involves inserting an electrode array into the scala tympani (part of the cochlea) while attempting to avoid trauma to the inner ear anatomy and damage to the device. During the surgery, a radiologist may perform intraoperative radiographic imaging, and an audiologist may conduct electrophysiologic testing.
Intraoperative radiographic imaging is considered the gold standard for monitoring correct electrode placement during CI surgery. It may include plain film X-ray, three-dimensional rotational tomography X-ray, computed tomography scanning, and/or fluoroscopy. Intraoperative fluoroscopy may be used when implanting an abnormally shaped cochlea to confirm proper electrode placement.
Electrophysiologic measures are used to verify whether the device is working properly. The measures determine the auditory nerve’s responsiveness to electric stimulation and may be used to assess cochlear trauma in an effort to preserve residual hearing during electrode insertion. During such testing, the seventh nerve, the eighth nerve, and/or the stapedial reflex may be activated electrically through the implanted electrodes, with the response visible via physical observation or telemetric recording. Tests done during surgery may include, but may not be limited to, electrode impedance, electrically evoked compound action potentials (ECAPs), spread of excitation (SoE), and electrically evoked stapedial reflex thresholds (ESRTs).
Universal clinical practice guidelines are not available for intraoperative monitoring. Each clinic and/or surgeon may develop their own protocol.
Unilateral Implantation, Bilateral Implantation, Bimodal Hearing, and Combined Electric and Acoustic Stimulation
There are various approaches to cochlear implantation treatment. CIs can be used alone or in combination with other devices. Individualized treatment requires consideration of possible benefits and drawbacks of each approach based on the specifics of each patient.
Variations of cochlear implantation and implant use include the following options:
Unilateral cochlear implantation is an effective intervention for restoring or providing bilateral hearing to adults and children with unilateral hearing loss or single-sided deafness. Research with adults and children has shown improvements in sound localization, speech perception in quiet and in noise, self-reported quality of life (per questionnaire), and other measures after cochlear implantation (Benchetrit et al., 2021; Brown et al., 2022; Dillon et al., 2018; Lindquist et al., 2023; Park et al., 2023; Távora-Vieira & Wedekind, 2022).
Bilateral cochlear implantation may result in better sound localization, enhanced understanding of speech in quiet and noisy environments, more natural-sounding speech, more patient-perceived functional benefit and satisfaction, and improved language development (Brown & Balkany, 2007; Buss et al., 2008; Lammers et al., 2014; Laske et al., 2009; Litovsky et al., 2006; Sammeth et al., 2011). The decisions regarding bilateral implantation are based on an evaluation of each ear, a determination that each ear meets the criteria for implantation, and potential benefits for the patient.
The bimodal hearing option may provide advantages (as opposed to unilateral cochlear implantation only) in the perception and localization of sound as well as in the understanding of speech in quiet and noise (Berrettini et al., 2010; Ching et al., 2006; Luntz et al., 2005).
Research on electric and acoustic stimulation demonstrated consistently higher speech perception scores as compared with electric stimulation alone (Dillon et al., 2015; Gantz et al., 2016; Incerti et al., 2013; Park, Teagle, et al., 2019), showing the potential significance of preserving and using low-frequency hearing in the implanted ear when appropriate.
Because the first several years of life are a critical period for speech and language development, cochlear implantation is recommended at an early age, if applicable, possible, and preferred by the child’s family. Age at implantation and residual hearing status have been associated with the rate of spoken language development, the level of auditory skill development, and the likelihood of acquiring typical spoken language skills (Culbertson et al., 2022; Leigh et al., 2013; Moura et al., 2023; Niparko et al., 2010; Wu et al., 2023). Longer inter-implant intervals for bilateral implantation have been shown to result in discrepancy in central processing and, subsequently, have negative effects on receptive and expressive language development (López-Torrijo et al., 2015). Due to the neuroplasticity and the critical periods of auditory, speech, and language development in young children, it may be more beneficial to perform simultaneous or short-interval sequential implantation in this population (López-Torrijo et al., 2015).
Post Surgery
Detailed postsurgical and follow-up instructions are given to the patient and/or their caregivers/care partners, including keeping the area clean and safeguarding against infection. Postoperative audiologic evaluation and follow-up may include, but not be limited to, further counseling and education, inspecting and troubleshooting the device, and evaluating residual hearing.
The audiologist will schedule several individualized programming sessions with the patient and their caregivers/care partners across a time span of several months. During a CI programming session, the audiologist customizes the processor to the needs of the CI listener. The exact programming steps will vary according to the manufacturer and the abilities of the patient and may include subjective and/or objective measurements.
Generally, programming a CI may be divided into two phases: (1) initial stimulation and (2) follow-up.
During the initial programming session, the audiologist is looking to confirm that the CI is working properly and to validate surgical procedure results. As in surgery, electrode impedance is used to measure the integrity of the electrodes in the device. Electrodes functioning with abnormal electrode impedance may result in poor sound quality, pitch confusion, and overall reduced performance of the CI. ECAP responses determine the collective response of the auditory nerve to device stimulation. ESRT values are correlated with loudness comfort levels obtained behaviorally (Kosaner et al., 2009; Lorens et al., 2004; Polak et al., 2006) as well as higher speech recognition scores and more favorable quality of sound (Holder et al., 2023). As in populations with typical hearing, reliable measurement of an electrically evoked stapedial reflex requires a healthy middle ear. The patient must sit still and remain silent to maintain an acoustic seal for the measurement probe and to prevent artifacts from movement and/or vocalization from obscuring the reflex response.
Audiologists monitor the function of both the internal and external devices, assess the patient’s access to sound, and program the device to optimize CI performance at subsequent visits. The audiologist may work collaboratively with the aural (re)habilitation provider during follow-up sessions to consider auditory and functional listening skills in respect to optimal programming.
Education regarding long-term use, care, and maintenance of a CI includes instruction on the following activities:
Daily listening checks can be completed by the patient, a parent, a family member, a trained support person, an SLP, a teacher, or an audiologist. If the patient is utilizing combined electric and acoustic stimulation technology, daily listening checks with the acoustic portion of the implanted ear are advised to ensure acoustic hearing maintenance.
The process of aural habilitation is designed to help a person with hearing loss attain listening and communication skills that they have yet to acquire (i.e., in the case of prelingual hearing loss). The goal of aural rehabilitation is to help a person with hearing loss maintain, reestablish, or improve listening skills and communication function while preventing or minimizing limitations on a person’s well-being and communication due to auditory dysfunction (i.e., in the case of postlingual hearing loss). Both aural habilitation and aural rehabilitation are interactive processes, which are individualized as well as patient- and family-centered. Interpersonal, psychosocial, educational, and vocational functioning may be considered. See the ASHA Practice Portal pages on Aural Rehabilitation for Adults and Language and Communication of Deaf and Hard of Hearing Children for more information.
After cochlear implantation, the patient can begin aural (re)habilitation services with an audiologist and/or an SLP to build auditory skills to learn how to listen to, discriminate between, and understand the range of sounds (e.g., environmental sounds, spoken language, music) conveyed via the device. The treatment plan is individualized for the patient based on age, developmental norms, hearing history, and specific needs and goals. For example, one focus of treatment for very young children is the development of overall speech, language, listening, and communication skills. In contrast, the treatment plan for school-age children may address functional listening skills, academics, independence, and self-advocacy. A treatment plan for adults may take into consideration functional listening skills and communication strategies in social and work situations as well as individual lifestyle needs. The communication mode(s) preferred by the patient and/or their family/caregivers/care partners will influence the specific goals and activities in the aural (re)habilitation plan of care.
It is often difficult to predict a patient’s level of success after cochlear implantation. Significant differences may exist between CI recipients in the rate of progress and in ultimate outcomes. Even in instances of successful surgery and properly functioning device(s), limited outcomes may still occur. Several factors can impact the user’s benefit from the implant and the user’s development of listening and spoken language skills (Cosetti & Waltzman, 2012; Geers et al., 2011; Moberly et al., 2016). In pediatric cases, early implantation and device use have been associated with successful outcomes (Park, Gagnon, et al., 2019; Purcell et al., 2021; Sharma & Campbell, 2011). In adult cases, duration of deafness has been associated with outcomes (Beyea et al., 2016; Blamey et al., 2012; Green et al., 2007; Holden et al., 2013; Leung et al., 2005). Other factors—such as consistency of device use, appropriate follow-up, and participation in (re)habilitation services—are also important.
The patient’s frequent communication partners can receive guidance on the use of effective communication strategies as well as expectations related to CI use. Family involvement is a critical part of the aural (re)habilitation process.
Communication Approaches
CI recipients may employ one or more of the following languages, tools, systems, technologies, or strategies, depending upon their individual goals and preferences:
The selection of a communication approach is not a one-time decision but, rather, a dynamic process that allows for changes over time. The CI team will review the long-term goals of the patient and/or their family/caregivers/care partners to determine how certain communication approaches align with those goals. See the ASHA Practice Portal page on Language and Communication of Deaf and Hard of Hearing Children for more information on this topic.
Treatment Plan Components
An individualized aural (re)habilitation plan may include, but not be limited to, the following components:
Hearing assistive technology systems (HATS) improve speech understanding in difficult listening situations by increasing the signal-to-noise ratio. HATS may be used in conjunction with a CI. Adverse conditions impacting communication can include the distance between the speaker and the listener, competing noise, room acoustics, and room lighting. Several types of HATS may be used with CIs to improve listening experiences and outcomes. Devices may include FM or DM systems, wireless accessories, infrared systems, Bluetooth adaptors, amplified and captioned telephones, audio loops, and amplified and/or visual alarms (e.g., baby monitor, clock alarm, doorbell, smoke detector). See ASHA’s resource on hearing assistive technology for more information.
Health insurance coverage for CI services has expanded in recent years. Many state Medicaid programs offer some coverage, and supplemental funds may be available through combined federal/state programs. Due to the acceptance of CIs as a standard of care, Medicare, the Veterans Health Administration, and many private insurance payers cover all or part of the CI surgery and postsurgical services. Insurance coverage can vary in regard to factors such as bilateral versus unilateral cochlear implantation, simultaneous or sequential bilateral implant surgeries, and clinical investigations approved by private payers.
For more information regarding CI coverage, visit ASHA’s resource on billing and reimbursement as well as U.S. Food & Drug Administration: Cochlear Implants and Centers for Medicare & Medicaid Services: Cochlear Implantation.
This list of resources is not exhaustive, and the inclusion of any specific resource does not imply endorsement from ASHA.
American Speech-Language-Hearing Association. (2016). Scope of practice in speech-language pathology [Scope of practice]. www.asha.org/policy/
American Speech-Language-Hearing Association. (2017). Issues in ethics: Cultural and linguistic competence [Ethics]. www.asha.org/practice/ethics/cultural-and-linguistic-competence/
American Speech-Language-Hearing Association. (2018). Scope of practice in audiology [Scope of practice]. www.asha.org/policy/
American Speech-Language-Hearing Association. (2023). Code of ethics [Ethics]. www.asha.org/policy/
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