This study aimed to identify the characteristics of home health care (HHC) patients, main diagnoses, service type, home visit patterns, and primary caregiver type from a major tertiary hospital in South Korea to provide basic data for tailored nursing care. We used Electronic Health Records (EHRs) data of 1776 patients, from 2011 to 2020, from a premier tertiary hospital in South Korea and conducted secondary data analysis using descriptive statistics, a chi-squared test, and an independent samples t-test. Patients’ mean age (i.e., 50.9% men and 49.1% women) was 74.50 ± 15.48 years. Further, admission to HHC via the outpatient and inpatient department comprised 1047 (59.0%) and 729 patients (41.0%), respectively. Based on the Korean Standard Classification of Diseases, neoplasms (49.9%) were identified as the most common main diagnosis, followed by diseases of the nervous system (10.3%) and musculoskeletal system and connective tissue disease (6.2%). An average of 2.2 homecare nursing services were provided per visit, with lab sampling (43.9%), other intravenous injections (31.0%), and ventilator care (23.0%) being the most frequent services. The total HHC service period for patients via the outpatient department was 76.88 days longer (292.24 vs 215.36 days) than those from the inpatient department. Younger patients were cared for by parents and siblings and older patients by spouses, offspring, and formal caregivers. It is pivotal to identify general characteristics of HHC patients through long-term monitoring and retrospective analysis to provide high-quality and tailored interventions to them.