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Official Description

Cochlear device implantation, with or without mastoidectomy

© Copyright 2026 American Medical Association. All rights reserved.

Common Language Description

A cochlear implant is a sophisticated electronic device designed to restore useful hearing in individuals suffering from severe bilateral sensorineural hearing loss. This type of hearing loss occurs when there is damage to the inner ear or the auditory nerve pathways to the brain. The cochlear implant functions by converting sound, including speech, into electrical energy, which then stimulates the auditory nerve fibers located in the inner ear. The device consists of two main components: an internal processor that is surgically implanted and an external component that includes a microphone and a speech processor. The surgical procedure involves creating a C-shaped incision above and around the ear to access the mastoid bone and the cochlea. Depending on the specific case, a mastoidectomy may be performed, which involves removing the mastoid air cells to facilitate access to the inner ear. The electrode array is then carefully inserted into the cochlea, allowing for direct stimulation of the auditory nerve. The internal processor is secured in a small depression created in the mastoid bone, and the incision is meticulously closed in layers to promote healing. The external components work in conjunction with the internal processor, enabling the user to receive and interpret sounds effectively, thereby improving their overall auditory experience.

© Copyright 2026 Coding Ahead. All rights reserved.

1. Indications

The cochlear device implantation procedure is indicated for patients who exhibit the following conditions:

  • Severe Bilateral Sensorineural Hearing Loss - Patients with significant hearing impairment in both ears that cannot be adequately managed with traditional hearing aids.

2. Procedure

The cochlear device implantation procedure involves several critical steps to ensure successful placement and functionality of the implant:

  • Step 1: Incision - A C-shaped incision is made beginning above the ear and extending around behind the ear. This incision provides access to the underlying structures necessary for the implantation.
  • Step 2: Mastoidectomy (if applicable) - If a mastoidectomy is indicated, the surgeon enters the mastoid bone and removes the mastoid air cells using a high-speed drill and various burs. This step is crucial for creating a clear pathway to the inner ear.
  • Step 3: Accessing the Cochlea - In cases where a mastoidectomy is not performed, the surgeon drills through the mastoid bone directly to reach the inner ear. This allows for the insertion of the electrode array.
  • Step 4: Insertion of Electrode Array - The electrode array is carefully inserted into the cochlea, which is essential for stimulating the auditory nerve fibers and restoring hearing.
  • Step 5: Placement of Receiver/Stimulator - A small depression is created in the mastoid bone where the receiver/stimulator is placed and secured to the skull. This component is vital for receiving signals from the external processor.
  • Step 6: Closure of Incision - The incision is closed in layers to promote optimal healing and minimize the risk of complications.

3. Post-Procedure

After the cochlear device implantation, patients typically undergo a recovery period during which they are monitored for any complications. Post-operative care may include pain management and instructions on how to care for the surgical site. Patients will also need to follow up with their healthcare provider for device activation and programming, which involves adjusting the external components to ensure optimal performance. Rehabilitation may be necessary to help patients adapt to the new auditory signals and maximize the benefits of the cochlear implant.

Short Descr IMPLANT COCHLEAR DEVICE
Medium Descr COCHLEAR DEVICE IMPLANTATION W/WO MASTOIDECTOMY
Long Descr Cochlear device implantation, with or without mastoidectomy
Status Code Active Code
Global Days 090 - Major Surgery
PC/TC Indicator (26, TC) 0 - Physician Service Code
Multiple Procedures (51) 2 - Standard payment adjustment rules for multiple procedures apply.
Bilateral Surgery (50) 1 - 150% payment adjustment for bilateral procedures applies.
Physician Supervisions 09 - Concept does not apply.
Assistant Surgeon (80, 82) 0 - Payment restriction for assistants at surgery applies to this procedure...
Co-Surgeons (62) 0 - Co-surgeons not permitted for this procedure.
Team Surgery (66) 0 - Team surgeons not permitted for this procedure.
Diagnostic Imaging Family 99 - Concept Does Not Apply
APC Status Indicator Hospital Part B services paid through a comprehensive APC
ASC Payment Indicator Device-intensive procedure added to ASC list in CY 2008 or later; paid at adjusted rate.
Type of Service (TOS) 2 - Surgery
Berenson-Eggers TOS (BETOS) P1G - Major procedure - Other
MUE 1
CCS Clinical Classification 26 - Other therapeutic ear procedures
LT Left side (used to identify procedures performed on the left side of the body)
RT Right side (used to identify procedures performed on the right side of the body)
GC This service has been performed in part by a resident under the direction of a teaching physician
GA Waiver of liability statement issued as required by payer policy, individual case
SG Ambulatory surgical center (asc) facility service
AS Physician assistant, nurse practitioner, or clinical nurse specialist services for assistant at surgery
22 Increased procedural services: when the work required to provide a service is substantially greater than typically required, it may be identified by adding modifier 22 to the usual procedure code. documentation must support the substantial additional work and the reason for the additional work (ie, increased intensity, time, technical difficulty of procedure, severity of patient's condition, physical and mental effort required). note: this modifier should not be appended to an e/m service.
50 Bilateral procedure: unless otherwise identified in the listings, bilateral procedures that are performed at the same session, should be identified by adding modifier 50 to the appropriate 5 digit code. note: this modifier should not be appended to designated "add-on" codes (see appendix d).
51 Multiple procedures: when multiple procedures, other than e/m services, physical medicine and rehabilitation services or provision of supplies (eg, vaccines), are performed at the same session by the same individual, the primary procedure or service may be reported as listed. the additional procedure(s) or service(s) may be identified by appending modifier 51 to the additional procedure or service code(s). note: this modifier should not be appended to designated "add-on" codes (see appendix d).
52 Reduced services: under certain circumstances a service or procedure is partially reduced or eliminated at the discretion of the physician or other qualified health care professional. under these circumstances the service provided can be identified by its usual procedure number and the addition of modifier 52, signifying that the service is reduced. this provides a means of reporting reduced services without disturbing the identification of the basic service. note: for hospital outpatient reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well-being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
53 Discontinued procedure: under certain circumstances, the physician or other qualified health care professional may elect to terminate a surgical or diagnostic procedure. due to extenuating circumstances or those that threaten the well being of the patient, it may be necessary to indicate that a surgical or diagnostic procedure was started but discontinued. this circumstance may be reported by adding modifier 53 to the code reported by the individual for the discontinued procedure. note: this modifier is not used to report the elective cancellation of a procedure prior to the patient's anesthesia induction and/or surgical preparation in the operating suite. for outpatient hospital/ambulatory surgery center (asc) reporting of a previously scheduled procedure/service that is partially reduced or cancelled as a result of extenuating circumstances or those that threaten the well being of the patient prior to or after administration of anesthesia, see modifiers 73 and 74 (see modifiers approved for asc hospital outpatient use).
58 Staged or related procedure or service by the same physician or other qualified health care professional during the postoperative period: it may be necessary to indicate that the performance of a procedure or service during the postoperative period was: (a) planned or anticipated (staged); (b) more extensive than the original procedure; or (c) for therapy following a surgical procedure. this circumstance may be reported by adding modifier 58 to the staged or related procedure. note: for treatment of a problem that requires a return to the operating/procedure room (eg, unanticipated clinical condition), see modifier 78.
59 Distinct procedural service: under certain circumstances, it may be necessary to indicate that a procedure or service was distinct or independent from other non-e/m services performed on the same day. modifier 59 is used to identify procedures/services, other than e/m services, that are not normally reported together, but are appropriate under the circumstances. documentation must support a different session, different procedure or surgery, different site or organ system, separate incision/excision, separate lesion, or separate injury (or area of injury in extensive injuries) not ordinarily encountered or performed on the same day by the same individual. however, when another already established modifier is appropriate it should be used rather than modifier 59. only if no more descriptive modifier is available, and the use of modifier 59 best explains the circumstances, should modifier 59 be used. note: modifier 59 should not be appended to an e/m service. to report a separate and distinct e/m service with a non-e/m service performed on the same date, see modifier 25.
74 Discontinued out-patient hospital/ambulatory surgery center (asc) procedure after administration of anesthesia: due to extenuating circumstances or those that threaten the well being of the patient, the physician may terminate a surgical or diagnostic procedure after the administration of anesthesia (local, regional block(s), general) or after the procedure was started (incision made, intubation started, scope inserted, etc). under these circumstances, the procedure started but terminated can be reported by its usual procedure number and the addition of modifier 74. note: the elective cancellation of a service prior to the administration of anesthesia and/or surgical preparation of the patient should not be reported. for physician reporting of a discontinued procedure, see modifier 53.
78 Unplanned return to the operating/procedure room by the same physician or other qualified health care professional following initial procedure for a related procedure during the postoperative period: it may be necessary to indicate that another procedure was performed during the postoperative period of the initial procedure (unplanned procedure following initial procedure). when this procedure is related to the first, and requires the use of an operating/procedure room, it may be reported by adding modifier 78 to the related procedure. (for repeat procedures, see modifier 76.)
79 Unrelated procedure or service by the same physician or other qualified health care professional during the postoperative period: the individual may need to indicate that the performance of a procedure or service during the postoperative period was unrelated to the original procedure. this circumstance may be reported by using modifier 79. (for repeat procedures on the same day, see modifier 76.)
80 Assistant surgeon: surgical assistant services may be identified by adding modifier 80 to the usual procedure number(s).
82 Assistant surgeon (when qualified resident surgeon not available): the unavailability of a qualified resident surgeon is a prerequisite for use of modifier 82 appended to the usual procedure code number(s).
AQ Physician providing a service in an unlisted health professional shortage area (hpsa)
CR Catastrophe/disaster related
GW Service not related to the hospice patient's terminal condition
GZ Item or service expected to be denied as not reasonable and necessary
Q0 Investigational clinical service provided in a clinical research study that is in an approved clinical research study
Q1 Routine clinical service provided in a clinical research study that is in an approved clinical research study
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