1, Obstetrics: Obstetrics insurance must be purchased separately. Most maternity insurance allows women to stay in hospital for two days. In the United States, the normal delivery fee is 1850-2850 dollars.
2. Dentistry: It is best to do dental treatment in China first, because the cost of dental treatment in the United States is quite expensive.
3. Glasses: If you wear glasses, you should have your eyes checked before you leave. Unless your eyes are injured, health insurance generally won't pay for them.
4. Existing diseases: Most insurance companies will not pay medical expenses for diseases that existed before the insurance came into effect.
5. Other non-insurance coverage.
Further reading: How to buy insurance, which is good, and teach you how to avoid these "pits" of insurance.