2026 ICD-10-CM Diagnosis Code Z45.02Encounter for adjustment and management of automatic implantable cardiac defibrillator

ICD-10-CM Codes›Z00–Z99›Z40-Z53›Z45

ICD-10-CM Z45.02
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z45.02 is a billable ICD-10-CM diagnosis code for encounter for adjustment and management of automatic implantable cardiac defibrillator. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 314 through 316. The code is flagged as a questionable admission, since it rarely justifies inpatient admission on its own and exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Implant, device or graft related encounter.

Code Identity

ICD-10-CM Code
Z45.02
Billable Status
Yes — Valid for Submission
Code Describes
Encounter for adjustment and management of automatic implantable cardiac defibrillator
Short Description
Encntr for adjust and mgmt of automatic implntbl card defib
Parent Code
Z45.0
Encounter for adjustment and management of cardiac 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 CodeZ45.02Encounter for adjustment and management of automatic implantable cardiac defibrillator

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z45.02.

Questionable admission codes
Some diagnoses are not usually sufficient justification for admission to an acute care hospital. For example, if a patient is given code R030 for elevated blood pressure reading, without diagnosis of hypertension, then the patient would have a questionable admission, since elevated blood pressure reading is not normally sufficient justification for admission to a hospital. The following list contains diagnosis codes identified as questionable admission when used.

Present on Admission (POA)Billing

Z45.02 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Encounter for adjustment and management of automatic implantable cardiac defibrillator with synchronous cardiac pacemaker
  • Encounter for adjustment and management of cardiac resynchronization therapy defibrillator (CRT-D)

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
            • cardiac
              • defibrillator (with synchronous cardiac pacemaker)
    • Admission(for)
      • adjustment (of)
        • device NEC
          • implanted
            • cardiac
              • resynchronization therapy defibrillator (CRT-D)
    • Fitting(and adjustment) (of)
      • automatic implantable cardiac defibrillator (with synchronous cardiac pacemaker)
    • Fitting(and adjustment) (of)
      • CRT-D (resynchronization therapy defibrillator)
    • Interrogation
      • cardiac defibrillator (automatic) (implantable)
    • Worn out
      • cardiac
        • defibrillator (with synchronous cardiac pacemaker)

Clinical ClassificationClinical

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

CCSR FAC009
Implant, device or graft related encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Pacemakers and Implantable Defibrillators

An arrhythmia is any disorder of your heart rate or rhythm. It means that your heart beats too quickly, too slowly, or with an irregular pattern. Most arrhythmias result from problems in the electrical system of the heart. If your arrhythmia is serious, you may need a cardiac pacemaker or an implantable cardioverter defibrillator (ICD).

Read the full article at MedlinePlus

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

Convert Z45.02 to ICD-9-CMHistory

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

ICD-9-CM
V53.32 Ftng autmtc dfibrillator
Exact Match The mapping is direct, with no qualifiers.

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 Z45.02Overview

Is Z45.02 (Encounter for adjustment and management of cardiac device) a billable code?

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

What MS-DRG does Z45.02 group to?

When encounter for adjustment and management of automatic implantable cardiac defibrillator is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 315, 316, with relative weights from 0.6821 to 2.0852 depending on complications. Higher weights mean higher Medicare reimbursement.

Does Z45.02 justify an inpatient admission?

Not on its own. The Medicare Code Editor lists this code as a questionable admission because encounter for adjustment and management of automatic implantable cardiac defibrillator is not usually sufficient justification for admission to an acute care hospital.

Is Z45.02 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 automatic implantable cardiac defibrillator on inpatient claims.

What is the ICD-9 equivalent of Z45.02?

Under the General Equivalence Mappings, encounter for adjustment and management of automatic implantable cardiac defibrillator converts to ICD-9-CM V53.32 (ftng autmtc dfibrillator). The mapping is a direct match.