How do insurance companies determine your coverage & rates?

The following factors influence the health insurance rates of an individual:

Age and gender of the person to be insured.
Pre-existing conditions after a thorough check-up of the individual's medical history.
Medical history of the family (whether or not the parents had heart disease, cancer etc.)
Smoking habits of the individual.

Previous records of mental health (whether the person had undergone counseling or used anti-depressants).
Choice of deductible, coverage and benefit limits, exclusions etc.
Past records of health insurance applications.