TL;DR
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, and 57.1% had four or more. Patients with four or more conditions were more likely than those with two or three 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 two or more chronic conditions, a pattern associated with greater use of emergency home visits. The University of Tsukuba-led research, published in the Journal of General and Family Medicine, adds evidence about the health needs of patients who receive care at home rather than regularly attending clinics or hospitals.
Researchers reviewed medical records to count participants’ chronic conditions and compared those counts with unscheduled physician visits at home requested after a sudden change in a patient’s condition. More than half of the study group, 57.1%, had four or more chronic conditions. The researchers defined multimorbidity as having at least two chronic conditions.
In the month examined, 13.2% of participants had at least one emergency home visit. Patients with four or five chronic conditions were significantly more likely to require such a visit than patients with two or three. The association was stronger still among those with six or more conditions, according to the study summary. The supplied report does not give the size of the differences between these groups.
The findings come from a multicenter study of adults receiving home care through medical facilities in Tokyo and Ibaraki Prefecture. The paper is by Gen Nakayama and colleagues and carries the title “Multimorbidity Among Patients Receiving Home Care in Japan: Prevalence, Levels, and Association With Emergency Home Visits.” It was published in 2026 in the Journal of General and Family Medicine (DOI: 10.1002/jgf2.70170).
Condition Counts May Guide Home Care Planning
The results indicate that multiple chronic illnesses are common among the patients included in this study and that a higher condition count can be a practical marker of increased emergency-visit risk. For home care teams, reviewing the number of long-term conditions may help identify patients who could warrant closer monitoring or more detailed planning for changes in health.
That possible use should be kept in proportion. The study reports an association, not proof of cause: it does not show that having more conditions directly produces emergency visits, nor does the supplied account establish that a particular care plan would prevent them. The finding may help inform clinical assessment, but it is not a stand-alone prediction tool or a measure of how well home care services perform.
The issue has broader relevance as Japan’s population ages and more older adults receive medical care at home because they have difficulty traveling to clinics or hospitals. Knowing how common multiple conditions are in this setting can help services understand the complexity of patients’ needs. The study’s two-prefecture sample, however, cannot by itself establish the same prevalence or risk pattern for every region or home care population in Japan.
A Study Focused on Japanese Home Care
Home-based medical care involves physicians visiting people who have difficulty getting to clinics or hospitals. According to the report, multimorbidity has long been recognized as common among home care patients, but relatively few studies had measured its prevalence in this group. The research team set out to describe how many chronic conditions participants had and examine how those counts related to emergency home visits.
The study used medical-record information from 506 adults receiving physician-led home care at facilities in Tokyo and Ibaraki Prefecture. It grouped patients according to their number of chronic conditions, then compared those groups on whether they had needed an unscheduled physician visit during the previous month. This design offers a snapshot of the patients and period studied; the supplied material does not describe a nationwide survey or a long-term follow-up.
The researchers’ measure of multimorbidity was straightforward: two or more chronic conditions. Their analysis also separated patients into different condition-count levels, including two or three, four or five, and six or more. Those categories allowed the team to report that emergency home visits were more likely at higher counts, without establishing why individual patients needed urgent care.
“A simple count of chronic conditions may help health care professionals identify home care patients at increased risk of sudden health deterioration who may benefit from more proactive care planning.”
— The study authors, as summarized in the report
Limits of the Risk Association
The available report does not provide the exact emergency-visit rates for each condition-count group, the number of visits per patient, or the statistical estimates behind the reported differences. It also does not specify which chronic conditions were most common or whether factors such as age, severity of illness, or available caregiver support affected the association.
The findings do not establish that a higher count of conditions causes sudden deterioration or that counting conditions alone can reliably predict an individual patient’s needs. The study covered patients receiving care through facilities in two Japanese prefectures, so how well the results apply to other parts of Japan or other health systems remains unclear. The supplied material also does not say whether the team plans broader research or a trial of care-planning approaches.
Further Testing Across Care Settings
The study is published, but the report does not announce a next research milestone or a change to home care policy. The immediate clinical implication offered by the authors is that professionals may use a patient’s chronic-condition count as one prompt for closer review and proactive planning, alongside the patient’s wider medical and care needs.
To determine how useful that approach is, future research would need to test whether the association holds in larger and more geographically varied groups, and whether condition counts add useful information beyond other patient characteristics. It would also take evaluation of actual care-planning measures to learn whether they reduce emergency visits or improve patient outcomes. No such effect is established by the findings reported here.
Key Questions
What did the Japanese home care study find?
Among 506 adults receiving physician-led home care in Tokyo and Ibaraki, 94.7% had at least two chronic conditions. The study also found that higher condition counts were associated with a greater likelihood of an emergency home visit.
How did the study define multimorbidity?
The researchers defined multimorbidity as two or more chronic conditions. They also reported that 57.1% of participants had four or more conditions.
How many patients needed an emergency home visit?
13.2% of participants had at least one emergency home visit in the previous month. The report does not give exact visit rates for each chronic-condition group.
Does the study show that multiple conditions cause emergency visits?
No. It reports an association between higher condition counts and emergency home visits, but does not establish that multimorbidity caused the visits or that a specific care plan would prevent them.
Do the findings apply to all home care patients in Japan?
That is not established. The study included patients receiving care through facilities in Tokyo and Ibaraki Prefecture; the supplied report does not describe it as a nationwide sample.
Source: rss
