2026 ICD-10-CM Diagnosis Code Z45.010Encounter for checking and testing of cardiac pacemaker pulse generator [battery]

ICD-10-CM Codes›Z00–Z99›Z40-Z53›Z45

ICD-10-CM Z45.010
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z45.010 is a billable ICD-10-CM diagnosis code for encounter for checking and testing of cardiac pacemaker pulse generator [battery]. 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. Coders also document this condition as cardiac pacemaker battery depletion at elective replacement indicator timing alert. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Conduction disorders; and Implant, device or graft related encounter.

Code Identity

ICD-10-CM Code
Z45.010
Billable Status
Yes — Valid for Submission
Code Describes
Encounter for checking and testing of cardiac pacemaker pulse generator [battery]
Short Description
Encntr for checking and test of card pacemaker pulse gnrtr
Parent Code
Z45.01
Encounter for adjustment and management of cardiac pacemaker

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 CodeZ45.010Encounter for checking and testing of cardiac pacemaker pulse generator [battery]

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z45.010.

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

Z45.010 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Cardiac pacemaker battery depletion at elective replacement indicator timing alert
  • Cardiac pacemaker in situ

Tabular List NotesGuidance

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

Inclusion Terms

  • Encounter for replacing cardiac pacemaker pulse generator battery

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
              • pacemaker (cardiac resynchronization therapy (CRT-P))
                • pulse generator
    • Admission(for)
      • adjustment (of)
        • pacemaker (cardiac resynchronization therapy (CRT-P))
          • cardiac
            • pulse generator
    • Change(s) (in) (of)
      • pacemaker
        • pulse generator
    • Checking(of)
      • cardiac pacemaker (battery) (electrode (s))
        • pulse generator
    • Fitting(and adjustment) (of)
      • CRT-P (cardiac resynchronization therapy pacemaker)
        • pulse generator
    • Fitting(and adjustment) (of)
      • pacemaker (cardiac) (cardiac resynchronization therapy (CRT-P))
        • pulse generator
    • Removal(from) (of)
      • cardiac pulse generator (battery) (end-of-life)
    • Test, tests, testing(for)
      • cardiac pulse generator (battery)
    • Worn out
      • cardiac
        • pacemaker
          • battery

Clinical ClassificationClinical

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

CCSR CIR016
Conduction disorders
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR FAC009
Implant, device or graft related encounter
Default principal diagnosis: inpatient No · outpatient No

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 Z45.010 to ICD-9-CMHistory

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

ICD-9-CM
V53.31 Ftng cardiac pacemaker
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 Z45.010Overview

Is Z45.010 (Encounter for adjustment and management of cardiac pacemaker) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report encounter for checking and testing of cardiac pacemaker pulse generator [battery] on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Z45.010 group to?

When encounter for checking and testing of cardiac pacemaker pulse generator [battery] 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 Z45.010 justify an inpatient admission?

Not on its own. The Medicare Code Editor lists this code as a questionable admission because encounter for checking and testing of cardiac pacemaker pulse generator [battery] is not usually sufficient justification for admission to an acute care hospital.

Is Z45.010 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 checking and testing of cardiac pacemaker pulse generator [battery] on inpatient claims.

What is the ICD-9 equivalent of Z45.010?

Under the General Equivalence Mappings, encounter for checking and testing of cardiac pacemaker pulse generator [battery] converts to ICD-9-CM V53.31 (ftng cardiac pacemaker). The mapping is approximate, so confirm the match fits the documentation.