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Background: The effect of cardiac rehabilitation (CR) on patients undergoing device implantation (DI) for arrhythmias has been reported; however, the implementation status of these patients has not been clarified. This study aimed to verify the implementation status of CR for patients with heart disease who have undergone DI using real‐world data. Methods: This was an observational study using a nationwide administrative database associated with the diagnosis procedure combination (DPC) system in Japan (2014–2018). Subjects were patients with heart disease (70 667 cases) who underwent DI during the above scheduled hospitalization period. The overall rate of CR and the background factors of the subjects were verified. Results: The CR rate for patients with heart disease who underwent DI during hospitalization was 23%, and the CR rate for patients with comorbid heart failure who underwent DI was only 32%. It was confirmed that progressing age was associated with a higher CR implementation rate. The lower the Barthel index score at the time of admission, the higher the CR implementation rate. Conclusions: CR was performed for only one‐quarter of all the patients during admission for DI and just one‐third of the patients for DI with heart failure. Most of these patients were elderly and had a decreased ability to perform activities of daily living. The DPC data are subject to various limitations, and further research is necessary. [ABSTRACT FROM AUTHOR]