Stem cell treatment in Japan: check the clinic before you travel

What registration does — and does not — mean

It means the clinic submitted a plan, a certified committee reviewed it, and the plan is on the public record. Japan classifies these into Class I, II and III by risk level.

It does not mean the treatment is proven to work. These treatments are provided as自由診療 (self-funded care). They are not approved pharmaceuticals, and the government does not certify their effectiveness. Registration is about procedure and safety oversight, not results.

Important: treatments using stem cell culture supernatant or exosomes are outside this law and are not registered at all. The Ministry of Health, Labour and Welfare has stated that no such product has pharmaceutical approval in Japan. If a clinic offers these, there is no filing for you to check.

Cost: none of this is covered by insurance

All of these treatments are self-funded. Japanese public health insurance does not cover them — not for residents, and not for visitors. Travel insurance generally does not cover elective treatment either. When we checked 639 clinic websites, only about 45% published a price you could total up. Ask for the full amount in writing, including cell processing, number of sessions, follow-up visits, and any storage fees.

What our 19-point score measures

We opened 547 clinic websites one by one and applied the same 19 checks to all of them: does the clinic publish its filing number, where cells are cultured, the possible adverse events, the total price, the conditions under which it will not treat you, and its emergency transfer arrangement.

The score measures disclosure only. It does not measure treatment outcomes, physician skill, or patient satisfaction — none of which can be verified from outside. A low score means we could read little from the website, not that the clinic is bad.

Risks, and what Japan reports

Clinics must report deaths and serious events suspected to be caused by the treatment to the national government within 7 days. Cumulatively through March 2025, 10 deaths were reported in treatment and 6 in research. These are reports of suspected causation, not confirmed causes. Separately, only 13 of the 547 clinics we reviewed publish which hospital they transfer you to in an emergency — worth asking directly, especially if you are flying home soon after.

Common questions

I have seen clinics in Mexico, Panama and the Caribbean offering the same thing. How is Japan different?

The difference is not that Japan promises better results — it does not promise results at all. The difference is that Japan requires a filing under the Act on the Safety of Regenerative Medicine, review by a certified committee, and publication of the institution on a public register you can search from home before you book. In most stem cell tourism destinations there is no equivalent list to check. Use that, because it is the one thing you can verify at a distance.

The FDA has warned about unapproved stem cell clinics. Are Japanese clinics FDA-approved?

No, and no regulator anywhere has approved these as products. Japan’s filing system is about procedure and safety oversight, not efficacy: the government does not certify that the treatment works. If a clinic tells you Japanese government approval means the treatment is proven, that is a misrepresentation of what the filing is.

Will my insurance cover any of this, and can I claim it back at home?

Japanese public health insurance does not cover it, for residents or visitors. Most travel and private policies exclude elective treatment abroad. Ask your insurer in writing before you travel rather than after — and get a fully itemised quote from the clinic so you know the real total.