What National Health Insurance Does Not Cover in Japan: Aging-Body Costs Retirees Should Budget

What NHI covers, and the aging-body costs it does not

For day-to-day medicine, Japan's national health insurance is one of the strongest reasons to retire here: once you are a registered resident you pay a share of the bill, typically 30 percent, dropping to 20 percent at 70 and 10 percent for most people from 75, with monthly caps that stop a serious illness from emptying your savings. The enrollment mechanics are covered in that healthcare guide, so this article does not repeat them. What it does is map the part the system was never built to cover: the aging-body costs that arrive quietly and land mostly on you.

Three of these grow with almost everyone: teeth that need more than a filling, eyes that need a real prescription, and ears that stop keeping up with a noisy room. None of them is exotic, and none of them is a crisis on the scale of a hospital admission, which is exactly why retirees underbudget them. A single ceramic crown, two pairs of glasses, and a pair of hearing aids can quietly total more in a year than several months of insured doctor visits, and the public system contributes little to none of it.

Keep one boundary clear before going further. This article is about the medical-insurance side: the things kokumin kenko hoken (National Health Insurance) and the 75-and-over Late-Stage Elderly system do not pay for. It is a different system from long-term care insurance (kaigo hoken), which covers help with daily living such as home helpers and day services. Where that care side stops is a separate question, covered in what long-term care insurance does not cover in Japan. If your concern is bathing help or a care manager rather than crowns and hearing aids, that is the article to read instead.

Dental: where the 30 percent stops

Japan's insurance covers more dentistry than many countries: examinations, fillings, root canals, extractions, and the basic versions of crowns and dentures are all in the covered toolkit, paid at the same 30 percent share (less for older residents) as the rest of medicine. The edge appears the moment you want a material or a procedure the system classes as elective rather than functional.

Crowns are the clearest example. An insured crown is restricted in material: typically a metal or metal-and-resin type at the back, and a covered tooth-colored option such as a CAD/CAM resin crown in certain positions. If you ask for ceramic or zirconia for appearance, the whole treatment is reclassified as private (jihi) and you pay the full amount, with no insurance contribution at all, not even on the part that would have been covered. Reports put a single ceramic crown in the rough range of ¥80,000 to ¥150,000 or more against a few thousand yen for the insured equivalent, though prices vary widely by clinic and city.

Dental implants sit fully outside coverage. Replacing a missing tooth with an implant is treated as elective across almost all cases, so the patient pays everything; a single implant including the crown commonly runs in the ¥350,000 to ¥450,000 range, and full-mouth work reaches into the millions of yen. Dentures, by contrast, are covered in their standard form, which matters for older retirees: a basic insured denture is an affordable, functional option, and the out-of-pocket jump only comes if you choose premium metal-framed or flexible private versions. Orthodontics and whitening are not covered either. The practical retirement lesson is to separate function from appearance: insured dentistry will keep you eating and free of pain inexpensively, and the large bills are almost always the aesthetic or premium-material upgrades.

Vision: glasses and the line between an eye exam and an eye doctor

This is where the rule is simplest and the surprise is sharpest. Routine prescription glasses and contact lenses for ordinary nearsightedness, farsightedness, or astigmatism are not covered by national health insurance at all, at any age. Reading glasses for presbyopia, the near-vision decline that reaches almost everyone in later life, sit firmly outside coverage too.

There is a clean distinction worth holding onto. An eye examination at an optical retailer (megane-ya) for the purpose of buying glasses is a retail service, often free, and the glasses you buy there are a retail purchase paid in full. A visit to an ophthalmology clinic (ganka) for a medical reason, cataracts, glaucoma, diabetic eye disease, an infection, is medical care and is covered at your normal co-payment share. So the eye doctor who treats disease is inside the system; the glasses that correct everyday vision are not. The narrow exceptions are therapeutic, mainly children under nine with conditions such as amblyopia, or correction after certain eye surgery, none of which apply to a typical retiree buying reading glasses.

The good news is that retail glasses in Japan are not expensive by international standards. Functional frames with prescription lenses start around ¥5,000 at chain opticians, and a competent pair sits comfortably in the low tens of thousands of yen even with progressive lenses. For a retiree this is a predictable recurring cost, not a shock: budget for a replacement pair every few years and treat the optician visit as shopping, while keeping the ophthalmologist for anything that is actually a medical change in your sight. If sight is failing alongside hearing in an older parent, the wider home-and-safety picture is covered in hearing and vision loss in an elderly parent in Japan.

Hearing aids: the disability-certificate subsidy gate

Hearing aids are the cost that catches foreign retirees most because the rule is counterintuitive. National health insurance does not pay for hearing aids as a general benefit. The only public help runs through a separate disability-welfare channel, the assistive-device payment (hosougu-hi shikyu) under the law on support for persons with disabilities, and the door into it is narrow.

To qualify, you generally need a physical disability certificate (shintai shougaisha techou) for hearing, and the bar for that certificate is high: the commonly cited benchmark is average hearing loss of around 70 decibels or worse in both ears, the level at which ordinary conversation is hard to follow even close up. International audiology practice often recommends hearing aids from around 40 decibels, so a large band of people, those with genuine but moderate age-related loss, sit above the help line but below the certificate threshold. Surveys suggest only around an eighth of Japanese hearing-aid owners receive a public subsidy; the rest pay in full. If you do hold the certificate, the device is supplied for roughly a 10 percent personal share against the standard cost, with income-based monthly caps, so the gate is hard to pass but generous once passed.

The two-step process matters for planning. First, a designated physician examines your hearing and issues an opinion, and the municipality issues the disability certificate, which can take several weeks. Only then do you file the assistive-device payment application, which can take roughly another month for approval. Nothing here is fast, so a retiree who waits until hearing has become a daily problem faces months of process on top of the loss. For everyone below the threshold, the relevant numbers are retail: hearing aids in Japan commonly run from about ¥30,000 for a basic single unit to ¥500,000 for a capable pair, with mid-range pairs frequently in the low hundreds of thousands of yen, paid entirely out of pocket and replaced every several years. Some municipalities run their own modest subsidy for older residents below the national threshold, but these are local, capped, and far from universal, so check your own city's welfare counter rather than assuming.

Budgeting these as a retiree on pension income

The three costs behave differently, and a realistic budget treats them differently. Glasses are a small, predictable, recurring expense. Dental splits into cheap insured maintenance and occasional large elective bills you largely control by choosing function over appearance. Hearing aids are the genuine wildcard: either heavily subsidized or fully self-paid, with no middle setting, decided by a certificate threshold rather than your budget.

For a 65-plus retiree living on pension income, possibly with a falling co-payment share as they pass 70 and then 75, the planning move is to ring-fence a separate annual line for these aging-body costs rather than assuming insurance absorbs them. The figures below are rough planning guides, not quotes, and every one varies by clinic, retailer, municipality, and year. Treat them as the order of magnitude to set aside, and confirm anything specific with the provider before committing.

How this sits alongside NHI and long-term-care insurance

Three systems touch an older resident's body, and keeping them apart prevents both nasty surprises and wasted worry. Medical insurance pays for doctors, hospitals, and prescriptions. Long-term care insurance pays for help with daily living after a care-need certification. The aging-body costs in this article fall between them, in a gap neither system was designed to fill.

Framed simply: if it treats a disease, medical insurance is likely in play; if it helps you live with reduced function day to day, long-term care insurance may be; if it is a device or appearance upgrade for an aging body, dental ceramic, retail glasses, an unsubsidized hearing aid, you are usually paying yourself. The hearing aid is the one true crossover, because the help that exists comes from the disability-welfare system rather than either insurance, which is why so many retirees miss it. For the full late-life money picture, including the cross-border tax and pension questions, work from the how to retire in Japan as a senior hub.

On the limits of what we do: Japan Care Concierge does not diagnose hearing or vision loss, fit devices, or rule on disability-certificate eligibility, and we never advise on tax. Diagnosis and the disability certificate run through a designated physician and your municipality's welfare counter; dental and optical choices belong with the clinic and optician. What we help overseas families with is the coordination around all of it: understanding which costs are insured and which are not before they arrive, getting an aging parent assessed, and arranging the local pieces, interpreting at appointments, sourcing providers, and keeping family abroad informed. If you want help mapping these costs for a specific person, contact us or model the wider picture with the cost simulator.