You should be talking about Taikang's million-dollar medical insurance, named Privileged Medical B. Like other million-dollar medical insurance on the market, this insurance is a high medical reimbursement insurance. The advantage of this kind of insurance is that it can guarantee renewal, but the condition is that it has passed the examination in the first two years and the deductible exceeds 500,000 before the examination. Its disadvantage is that it must be bound with other insurance of Taikang before it can be purchased, while other millions of medical insurance on the market can be sold separately.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.