2026 ICD-10-CM Diagnosis Code Z45.321Encounter for adjustment and management of cochlear device

ICD-10-CM Codes›Z00–Z99›Z40-Z53›Z45

ICD-10-CM Z45.321
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z45.321 is a billable ICD-10-CM diagnosis code for encounter for adjustment and management of cochlear device. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 154 through 156. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Hearing loss; and Implant, device or graft related encounter.

Code Identity

ICD-10-CM Code
Z45.321
Billable Status
Yes — Valid for Submission
Code Describes
Encounter for adjustment and management of cochlear device
Short Description
Encounter for adjustment and management of cochlear device
Same as the full description in the CMS dataset.
Parent Code
Z45.32
Encounter for adjustment and management of implanted hearing device

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ40-Z53Encounters for other specific health care
CategoryZ45Encounter for adjustment and management of implanted device
This CodeZ45.321Encounter for adjustment and management of cochlear device

Present on Admission (POA)Billing

Z45.321 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Admission(for)
      • adjustment (of)
        • device NEC
          • implanted
            • hearing device
              • cochlear
    • Management(of)
      • cochlear device (implanted)

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR EAR004
Hearing loss
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR FAC009
Implant, device or graft related encounter
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Cochlear Implants

A cochlear implant is a small, complex electronic device that can help to provide a sense of sound. People who are profoundly deaf or severely hard-of-hearing can get help from them. The implant consists of two parts. One part sits on the outside of the body, behind the ear. A second part is surgically placed under the skin.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Z45.321 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V53.09 Adj nerv syst device NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z45.321Overview

Is Z45.321 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report encounter for adjustment and management of cochlear device on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Z45.321 group to?

When encounter for adjustment and management of cochlear device is the principal diagnosis on an inpatient stay, it groups to MS-DRG 154, 155, 156, with relative weights from 0.6911 to 1.5635 depending on complications. Higher weights mean higher Medicare reimbursement.

Is Z45.321 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for encounter for adjustment and management of cochlear device on inpatient claims.

What is the ICD-9 equivalent of Z45.321?

Under the General Equivalence Mappings, encounter for adjustment and management of cochlear device converts to ICD-9-CM V53.09 (adj nerv syst device NEC). The mapping is approximate, so confirm the match fits the documentation.