20 kinds of serious diseases include: childhood leukemia, congenital heart disease, end-stage renal disease, breast cancer, cervical cancer, severe mental illness, drug-resistant tuberculosis, AIDS opportunistic infection, hemophilia, chronic myeloid leukemia, cleft lip and palate, lung cancer, esophageal cancer, gastric cancer, type I diabetes, hyperthyroidism, acute myocardial infarction, cerebral infarction, colon cancer and rectal cancer.

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Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.