What the Family Confirms First
Dai-ni-gou Hihokensha: Category 2 Coverage From 40 to 64
Between ages 40 and 64, a resident is a Category 2 insured person, which means care insurance only applies if the need for care traces back to one of 16 aging-related diseases.
Japan's long-term care insurance splits its insured population into two categories. Category 1 covers everyone aged 65 and over, who can use the system regardless of why they need care. Category 2 covers residents aged 40 to 64, and for this group the law adds a filter: care is only certifiable if it results from one of 16 government-listed conditions. The general structure of the insurance is covered in long-term care insurance in Japan; this article stays specifically on the under-65 route, which that guide only touches briefly.
This is a different question from whether a foreign resident can join the system at all. Long-term care insurance in Japan for foreigners covers eligibility by residency status; this article assumes eligibility is not in doubt and focuses on the age-and-diagnosis gate that sits in front of every Category 2 applicant, foreign or Japanese. A family that has just been told a 58-year-old parent had a stroke, or a spouse just diagnosed with early-onset dementia, is usually trying to answer one narrow question: does this specific diagnosis unlock the system now, or does the family have to wait years for the birthday that removes the filter.
Tokutei Shippei: The 16 Diseases and How a Diagnosis Maps to Them
The Ministry of Health, Labour and Welfare (MHLW) names 16 specified diseases in Article 2 of the Long-Term Care Insurance Act Enforcement Order, and a Category 2 applicant's medical record has to point to one of them.
The official list, as published by MHLW and reproduced in Osaka Prefecture's English guide to the insurance system, covers: cancer judged by a physician to have no reasonable prospect of recovery; rheumatoid arthritis; amyotrophic lateral sclerosis (ALS); ossification of the posterior longitudinal ligament; osteoporosis with fracture; presenile (early-onset) dementia; progressive supranuclear palsy, corticobasal degeneration, and Parkinson's disease; spinocerebellar degeneration; spinal canal stenosis; premature aging syndrome (progeria); multiple system atrophy; diabetic neuropathy, nephropathy, and retinopathy taken together; cerebrovascular disease, meaning stroke and its aftermath; arteriosclerosis obliterans; chronic obstructive pulmonary disease (COPD); and osteoarthritis of both knees or hip joints with marked deformity.
MHLW's own explanation of the selection criteria states the list is built from conditions that appear more often after 65 but are still medically recognized before it, and that tend to produce a care-need or support-need state lasting three months or longer. That second condition matters in practice: a diagnosis on the list is necessary but the certification still turns on whether the resulting physical or cognitive decline is expected to persist, not on the diagnosis label alone. A family should not assume a diagnosis automatically equals certification; it equals eligibility to apply.
Early-Onset Dementia and Stroke: The Two Most Common Cases
In practice, the two conditions that bring most under-65 families into this system are early-onset dementia and stroke, both explicitly named on the 16-disease list.
Early-onset dementia, listed as presenile dementia, is the diagnosis behind a common family situation: a spouse in their 50s or early 60s starts showing memory or behavior changes, gets a diagnosis, and the family assumes long-term care insurance is years away. It is not. The diagnosis itself is one of the 16, so an application can start immediately after diagnosis rather than waiting for age 65. Broader context on adjusting daily care once a diagnosis is confirmed is in dementia care in Japan, which this article does not repeat.
Cerebrovascular disease, the list's term for stroke, is the other frequent trigger, and it tends to arrive with no warning: a parent or spouse in their late 50s has a stroke, is hospitalized, and the family is told inpatient rehabilitation has a time limit. Because stroke sits on the specified-disease list, the Category 2 route can be started as soon as the acute phase stabilizes, rather than after discharge. What continuing rehabilitation and home adjustment look like once a claim is moving is covered in stroke recovery and home care in Japan.
What the Doctor Provides
Shujii Ikensho: The Opinion Letter That Anchors the Claim
A Category 2 application depends heavily on the primary doctor's written opinion (shujii ikensho), which has to connect the diagnosis to one of the 16 specified diseases explicitly.
For a Category 1 applicant aged 65 or over, the family doctor's opinion describes overall physical and cognitive condition, and the reason for needing care can be almost anything. For a Category 2 applicant, the same opinion letter has to do more work: it has to state which of the 16 specified diseases is causing the need for care, because that link is what makes the application valid at all. If the opinion letter does not clearly tie the diagnosis to the list, the municipality's certification committee has no basis to approve a Category 2 claim, regardless of how much daily care the person actually needs.
This is one reason a specialist's diagnosis (a neurologist for early-onset dementia, for example, rather than a general practitioner's impression) tends to move the application forward faster. It is worth asking the treating physician directly whether the diagnosis, as they intend to document it, matches the wording MHLW uses for the specified disease, since informal terms used in conversation do not always match the formal disease name the opinion letter needs.
No Regular Doctor: What the Municipality Arranges
A resident without an established primary doctor is not blocked from applying; the municipality can introduce a physician to complete the opinion letter.
Foreign residents in their 40s and 50s are less likely than retirees to already have a long-standing relationship with a Japanese physician, especially if care has mostly been arranged around occasional appointments rather than an ongoing chronic condition. Osaka Prefecture's official guide to the insurance system states directly that for applicants without a family doctor, the municipality will introduce one, so the absence of a regular doctor is a logistical step to schedule, not a reason certification is out of reach.
What it does add is time. Building a new doctor relationship, getting the diagnosis formally documented against the specified-disease wording, and having that doctor complete the opinion letter all take longer than working with a physician who already has the person's history. Starting the process as early as possible after diagnosis, rather than waiting until daily care becomes unmanageable, gives that extra step room to happen without a crisis forcing the timeline.
What the Municipality Processes
Kenkou Hoken Sho: Applying With the Health Insurance Card, Not a Care Insurance Card
A Category 2 applicant uses their regular health insurance card to apply, since no separate care insurance card is issued until certification is granted.
Category 1 insured persons (65 and over) are issued a care insurance card automatically once they turn 65, and that card is what they present when applying. Category 2 insured persons are not issued that card in advance, because eligibility depends on the specified-disease condition rather than age alone. Instead, the application at the municipal office is made using the applicant's national health insurance card, employer health insurance card, or equivalent, alongside the physician's opinion letter describing the qualifying disease. This distinction trips up families who assume a missing care insurance card means they are not in the system yet; for a Category 2 applicant, that card was never going to exist before certification.
The application itself can be filed by the person, a family member, an adult guardian, or on their behalf by a community comprehensive support center, a designated care plan provider, or a welfare facility, per Osaka Prefecture's official procedure guide. A family living overseas is not required to be physically present to start this process, though someone locally accessible, whether family, a care manager, or a support center, generally needs to coordinate the visit and the paperwork on the ground.
Nintei Shinsakai: The Certification Committee's Review and Timeline
A municipal Certification Committee for Long-Term Care Need reviews the qualification investigation and the doctor's opinion together, and applicants are typically notified within about 30 days.
After the application is filed, a qualification investigator conducts a home visit or interview covering a standardized set of items, and that report is combined with the shujii ikensho before the municipality's certification committee decides. Osaka Prefecture's guide states results are usually notified within 30 days of submission, and that a new certification is valid for six months, extended to 12 months on renewal, though the period can be shortened or lengthened depending on the person's condition. For a Category 2 case, the committee is specifically checking that the certified need for care is attributable to the named specified disease, not just confirming a general decline.
If the certified care level looks too low for what the family is actually managing day to day, the process for challenging that result is the same for Category 2 as for Category 1, and is covered separately in care level appeals and level changes in Japan.
Ryouritsu Futan: How the Category 2 Premium Is Already Being Paid
Category 2 premiums are not a separate bill; they are collected together with the person's regular health insurance premium, and this group funds a meaningfully large share of the system.
Osaka Prefecture's 2024 guide states that Category 2 premiums (ages 40 to under 65) are calculated using the method specified by the person's national health insurance, employer health insurance, or mutual aid association, and are paid together with the medical insurance premium rather than as a separate line item. This means most residents in this age range have already been paying into the system, often without realizing it, well before any need for care arises.
On the financing side, the same 2024 guide states Category 1 premiums fund about 23% of the system and Category 2 premiums fund about 27%, for the 2024 to 2026 period, with the remainder split between national, prefectural, and municipal public funds. On the user side, once certified, a Category 2 beneficiary's co-payment is generally 10% of service costs, and stays at 10% regardless of income, unlike Category 1 co-payments, which can rise to 20% or 30% for higher pension income. A separate look at what that co-payment does and does not cap is in what long-term care insurance does not cover in Japan.
What Happens When the Diagnosis Doesn't Fit
Kotsuji ya Gaishou: Traffic Accidents and Conditions Outside the List
A resident under 65 who needs long-term care for a reason not on the 16-disease list, such as an injury from a traffic accident, cannot use long-term care insurance at all, regardless of how much daily support is needed.
This is the branch that catches families off guard, generally, because the assumption is that any serious injury or illness before 65 simply routes through the same insurance with different paperwork. It does not. If the underlying cause is not one of the 16 specified diseases, long-term care insurance does not apply to a Category 2 resident under any circumstances, even if the daily needs (bathing, mobility, cognitive supervision) look identical to those of a certified case. This applies to injury from an accident, a sports injury, or a condition simply not on the list.
The practical result is that the family has to look outside the long-term care insurance system entirely for support, which is a different application process, different providers, and a different funding structure than the one this guide otherwise describes.
Shougai Fukushi Service: The Disability Welfare Route
When a diagnosis under 65 does not match the 16 specified diseases, the applicable system is disability welfare services under the Act on Comprehensive Support for Persons with Disabilities, applied for through a separate municipal disability office rather than the long-term care insurance section.
Disability welfare services (shougai fukushi service) cover home help, day activity programs, and short stays in ways that parallel long-term care insurance services in substance, but the eligibility gate, the assessment process, and the office handling the application are all different from the long-term care insurance track this article otherwise describes. A resident under 40, or a resident 40 to 64 whose condition is not one of the 16 diseases, generally applies through this disability route instead.
A family should not assume the two systems can be mixed freely for the same need. Where a person later turns 65, or later develops a specified disease, or ages into Category 1 while already using disability welfare services, the two systems intersect and one generally takes priority depending on the service type; this is a genuinely case-by-case determination and varies by municipality, so it is worth confirming directly with the municipal disability welfare desk once age or diagnosis changes rather than assuming continuity.
After Certification: Handing Off to a Care Manager
Once a Category 2 applicant is certified, the next practical step is the same as for any certified resident: a care manager builds the care plan that turns the certification into actual weekly services.
Certification on its own does not deliver any service; it only unlocks eligibility. The person who turns that eligibility into a working schedule of home help, day service, or equipment rental is the care manager, and what a care manager actually does for a family navigating this system in English is covered in what a care manager in Japan does for a foreign family. For a Category 2 case specifically, it is worth telling the care manager directly which specified disease anchors the certification, since some service choices (day programs designed around dementia behavior, for instance, versus programs built for physical rehabilitation after stroke) are shaped by that underlying diagnosis rather than the numeric care level alone.
A family arranging this from overseas should expect the same rhythm as any Category 1 case once the plan starts: periodic review, renewal at 6 or 12 months, and a level that can be appealed if it stops matching daily reality. The age-and-diagnosis gate described in this article is a front door, not a different insurance system running in parallel for the rest of the journey.
| Point of comparison | Category 1 (age 65+) | Category 2 (age 40-64) |
|---|---|---|
| Who can use the system | Anyone certified, regardless of the reason for care | Only if care need results from 1 of 16 specified diseases |
| Card used to apply | Care insurance card, issued automatically at 65 | Health insurance card (national or employer), no separate care card until certified |
| How the premium is paid | Deducted from pension (special collection) or billed directly (ordinary collection) | Collected together with the medical insurance premium |
| Standard co-payment | 10 percent, rising to 20 or 30 percent for higher pension income | Generally 10 percent regardless of income |
| If the reason for care doesn't fit | Not applicable; any reason qualifies | Disability welfare services (shougai fukushi) via a separate municipal office |
Frequently asked questions
My spouse is 58 and just diagnosed with early-onset dementia in Japan. Can we apply for long-term care insurance now, or do we wait until 65?
You can apply now. Presenile (early-onset) dementia is one of the 16 specified diseases, so a resident aged 40 to 64 with this diagnosis can apply for certification immediately rather than waiting for age 65. Start by asking the treating doctor to prepare the opinion letter naming presenile dementia specifically.
A parent had a stroke at 58 in Japan. Does that count toward long-term care insurance, or only conditions people think of as "aging" diseases?
Stroke counts. Cerebrovascular disease is explicitly named on MHLW's list of 16 specified diseases, so a stroke at 58 can support a Category 2 application as soon as the acute hospital phase stabilizes, without waiting for the person to turn 65.
My relative is 45 and needs daily care after a traffic accident, not an illness. Does Japan's long-term care insurance cover this?
No. Long-term care insurance for someone aged 40 to 64 only applies when the need for care results from one of the 16 specified diseases, and a traffic accident injury is not on that list. This situation is generally handled through disability welfare services (shougai fukushi service) instead, applied for at a different municipal office.
We don't have a regular doctor in Japan yet. Can we still apply for long-term care insurance under 65?
Yes. If the applicant has no established primary doctor, the municipality will introduce one who can complete the required opinion letter. It adds time to the process, so it helps to start as soon as a qualifying diagnosis is confirmed rather than waiting.
How long does it take to hear back after applying for long-term care insurance as a Category 2 (under 65) applicant in Japan?
Municipalities typically notify applicants of the result within about 30 days of submission. A new certification is generally valid for six months, extended to 12 months at renewal, though the period can vary with the person's condition.
Do people under 65 pay the same amount out of pocket for long-term care insurance services as people over 65 in Japan?
Generally, Category 2 beneficiaries (40 to 64) pay a 10 percent co-payment regardless of income. Category 1 beneficiaries (65 and over) also start at 10 percent but can rise to 20 or 30 percent depending on pension and other income, a tier that does not apply the same way to Category 2 users.
How Japan Care Concierge can help
We walk families through the system steps on this page for their specific case: what to confirm first, which office to contact, and what to prepare before each conversation.
Primary and official references
We prioritize primary and official information when checking this article. Rules, costs, and local procedures can change, so verify the linked official sources before making a final decision. Last source check: 2026-07-05.
- MHLW: Concept Behind the Selection Criteria for Specified Diseases (Japanese)
- Osaka Prefecture: About the Long-Term Care Insurance System, April 2024 (English)
- e-Gov: Long-Term Care Insurance Act Enforcement Order, Article 2 (Japanese)
- MHLW: Relationship Between Long-Term Care Insurance and Disability Welfare Services (Japanese)
- MHLW: Long-Term Care and Elderly Welfare Policy Portal (Japanese)
About this article
This article is general orientation, not medical, legal, or individual care advice. Rules, costs, and service availability vary by municipality and by situation, so confirm specifics with the institutions involved or with licensed professionals. Publication and update dates above are actual dates. How we research, source, and correct articles is described in our editorial policy.