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A multicenter study of 506 adults receiving physician-led home care in Tokyo and Ibaraki found that 94.7% had at least two chronic conditions. Patients with four or more conditions were more likely to need an emergency home visit, though the study does not establish that multimorbidity caused those visits.
A study of 506 adults receiving physician-led home care in Tokyo and Ibaraki Prefecture found that 94.7% had at least two chronic conditions, and patients with higher condition counts were more likely to have an emergency home visit. The University of Tsukuba researchers say counting conditions could help care teams identify patients who may need closer planning, but the findings show an association rather than proof that the conditions caused sudden deterioration.
The research team reviewed medical records from patients receiving home visits from medical facilities in the two regions. It counted each patient’s chronic conditions and compared those totals with unscheduled physician visits at home requested after sudden changes in a patient’s condition. The study was published in the Journal of General and Family Medicine.
More than half of participants, 57.1%, had four or more chronic conditions. In the month covered by the analysis, 13.2% of patients had at least one emergency home visit. The researchers grouped patients by the number of conditions: compared with those who had two or three, patients with four or five—and especially those with six or more—were significantly more likely to require an emergency visit.
The report describes a snapshot of patients receiving home care, not all older adults in Japan. It does not provide a national prevalence estimate. The source material also does not give the absolute emergency-visit rates for each condition-count group, so readers cannot tell from the reported figures how large the difference was.
Condition Counts May Flag Care Needs
The findings point to a practical challenge for home-based care: many patients are managing several chronic illnesses at once, and the patients with the highest counts were more likely to need unscheduled medical attention. A simple count may be useful as one prompt for care teams to review support needs and plan for changes in a patient’s health.
That potential use remains a suggestion from the study, not a tested intervention. The researchers did not report that a condition-count screening program reduced emergency visits, nor that every person with many conditions will experience an emergency. A count also does not describe illness severity, how conditions interact, or the help available to the patient at home.
A Study of Home-Based Medical Care
In physician-led home care, doctors make regular visits to people who have difficulty traveling to clinics or hospitals. The source report frames the research against Japan’s aging population and the growth in older adults receiving this form of care. It also notes that, despite multimorbidity being common in home care, few studies had assessed how prevalent it was in this patient group.
The University of Tsukuba team addressed that gap by examining records from 506 patients at facilities in Tokyo and Ibaraki Prefecture. The paper, by Gen Nakayama and colleagues, is titled “Multimorbidity Among Patients Receiving Home Care in Japan: Prevalence, Levels, and Association With Emergency Home Visits.” It appeared in 2026 in the Journal of General and Family Medicine (DOI: 10.1002/jgf2.70170).
“A simple count of chronic conditions may help health care professionals identify home care patients at increased risk of sudden health deterioration.”
— The study authors, as summarized in the Medical Xpress report
How Broadly the Findings Apply
The available report does not state whether the 506 patients represent home care patients across Japan, and the study sample came from facilities in only Tokyo and Ibaraki Prefecture. The result that 94.7% had multimorbidity should therefore be read as a finding in this sample, not as a national rate.
The report does not provide the specific emergency-visit rates by condition-count group, the patients’ average age, or details on how factors such as illness severity and available support were accounted for. It also does not establish that multimorbidity itself caused emergency visits. Those details would help readers assess the size of the association and how well it applies to other care settings.
Further Evidence on Care Planning
The published study establishes the prevalence and association described in the participating facilities; the source report does not announce a follow-up study, a national rollout, or a change to care guidance. Further research could assess whether the pattern holds across more regions and patient groups, and whether adding condition counts to care planning helps teams respond to patients’ needs.
For now, the researchers’ proposed application is to use the number of chronic conditions as one possible signal for reviewing care plans. The reported findings alone do not specify a threshold for intervention or show that a particular planning approach prevents emergency visits.
Key Questions
How common was multimorbidity in the study?
94.7% of the 506 patients had two or more chronic conditions, the study’s definition of multimorbidity.
How many patients had four or more conditions?
57.1% of participants had at least four chronic conditions.
What counted as an emergency home visit?
The report defines these as unscheduled physician visits requested because of a sudden change in a patient’s condition. Overall, 13.2% of participants had at least one in the previous month.
Does the study show that multiple conditions cause emergency visits?
No. It found an association: patients with four or more conditions were more likely to have emergency home visits than those with two or three. The report does not establish causation.
Does the 94.7% figure apply to all Japanese home care patients?
The study covered 506 patients at facilities in Tokyo and Ibaraki. The available report does not establish that this sample represents all home care patients in Japan.
Source: rss
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