Japan's long-term care insurance passed its equity test — with one exception

Every ageing country is watching Japan, because Japan got there first and built a system for it. In 2000 it established a mandatory long-term care insurance scheme with universal public coverage — a social-insurance answer to a problem most health systems still handle through means-tested welfare or not at all [s1].

The question that has gone under-evidenced for a quarter century is whether universal coverage on paper delivered equal access in practice. A study published online on 12 May tests it directly [s1].

What "horizontal inequity" means here

The technical term is doing real work. Horizontal equity asks whether people with the same level of need receive the same care, regardless of ability to pay. That is different from asking whether everyone gets the same amount of care — an equitable system should deliver more care to people with greater need.

So the measurement has to adjust for need before it looks at income. The authors used corrected concentration indices, adjusted for assessed care needs, applied to nationally representative repeated cross-sectional data on community-dwelling people aged 40 and over who were certified beneficiaries of long-term care insurance between 2001 and 2022 — 39,743 observations in total [s1].

A concentration index above zero means use is concentrated among higher-income people; below zero, among lower-income people. After need adjustment, either direction is a departure from horizontal equity.

What the data show

In the early years of the insurance scheme, the pattern went in the direction few would predict. Formal care — particularly home-visit services — was more concentrated among lower-income individuals after adjusting for need [s1]. Informal care, mixed care and short-term stays were more concentrated among higher-income individuals [s1].

Over the following two decades, inequities in care arrangements and in most formal services moved closer to equity [s1]. Crucially, that convergence was not reversed by the later copayment increases imposed on higher-income users [s1].

Unmet care needs were low in prevalence and largely equitably distributed across income groups [s1].

One result runs against the general picture: need-adjusted time spent by the primary caregiver was more concentrated among lower-income individuals [s1]. Lower-income households are absorbing more informal caregiving hours for the same assessed need.

Why the copayment result matters

Japan's system uses means-tested copayments with caps on out-of-pocket payments [s1]. Copayment increases for higher earners are the standard lever available to an ageing system facing rising costs, and the standard objection to them is that cost-sharing deters use among people who cannot absorb it — turning a universal entitlement into a rationed one at the bottom of the income distribution.

That did not happen here, on this evidence. The authors' conclusion is that the means-tested copayment structure, combined with out-of-pocket caps, has not impeded equitable access for lower-income users [s1].

The exception they identify is specific: inequities persist for services that involve additional user charges [s1]. That is a narrower failure than a general access gap, and a more tractable one — it points at particular service categories rather than at the financing architecture as a whole.

The limits

This is repeated cross-sectional data, not a panel. It describes the distribution of use in each survey year across two decades; it does not follow individuals through their care trajectories, and it cannot establish that any specific policy change caused any specific shift in the concentration indices. The copayment finding is an observation that inequity did not worsen after the increases, not a causal evaluation of the increases.

The sample is community-dwelling certified beneficiaries aged 40 and over [s1]. People in institutional care are outside it, and so is anyone with care needs who was never certified — a group whose size the study cannot measure, though the low prevalence of reported unmet need is some evidence against it being large [s1].

Income-related inequity is also only one axis. The authors themselves flag that household composition and caregiving norms shape care composition across socioeconomic groups, and that policy should account for them [s1]. A household with a family member available to provide care and a household without one face different effective access at identical income and identical assessed need.

The caregiver finding is the one to sit with

The result that lower-income households provide more need-adjusted primary caregiver time [s1] is the part of this paper that a headline about equitable access will bury.

It describes a transfer that does not appear in any budget. Formal service use may be equitably distributed, but the residual — the hours a family member provides because formal care does not cover everything — is falling disproportionately on households with less income. Caregiver time is not free; it is foregone earnings and foregone rest. A system can be horizontally equitable in its formal service distribution and still be regressive in its total burden.

The authors' recommendation follows: strengthen targeted caregiver support [s1].

What to watch

Whether the equity picture holds as Japan's dependency ratio worsens and cost pressure on the scheme intensifies. This analysis covers 2001 to 2022 [s1], a period in which the system was expanding into maturity. The harder test comes when the financing gets tighter — and the specific thing to watch is the category the study already flags as inequitable: services with additional user charges attached.

This article is informational and does not constitute medical advice.

Sources

• [s1] Ping R, Hu B, Oshio T., "Horizontal inequity in long-term care access under universal coverage in Japan (2001-2022)," Health Policy, published online 12 May 2026. https://doi.org/10.1016/j.healthpol.2026.105653