Out-of-pocket medical costs ¥0 through high school age (no income limit)
Medical Expense Subsidy for Children (Maru-Nyu, Maru-Ko, Maru-Sei) / Koto City
Medical Expense Subsidy for Children (Maru-Nyu, Maru-Ko, Maru-Sei)Koto CityThrough high school ageNo income limit
Out-of-pocket medical costs ¥0 through high school age
Out-of-pocket share of insured care¥0No payment at the counter
- Until the first March 31 after turning 18
- You must apply for the medical certificate
For children who are Koto City residents until the end of the first fiscal year after turning 18, the city fully covers the out-of-pocket share when they receive insured care at a medical institution. There is no parent income limit, but you must apply for a medical certificate to receive the subsidy.
Nationality and residence status
The official page (checked in October 2026) sets no condition on nationality or residence status that we found. Eligibility follows the official conditions, not the language of this page; many programs require resident registration in the municipality.
Who is eligible
Koto City residents until the first March 31 after turning 18
When to apply
Apply to the city when eligible (at birth or move-in)
Notes
You must apply for the medical certificate. There is no income limit.