四百 よんひゃく よん びょう そとであれば
yonhyakuyombyōno sotodeareba

Noun
Da Copula

The "-eba" conditional form ("if/when…") of 四百四病の外

1. If/when it is not one of the four hundred and forty diseases.; If/when it's outside the four hundred and forty diseases.

Ba Conditional