What are you talking about?
Under current law, health insurance companies can’t refuse to cover you or charge you more just because you have a “pre-existing condition” — that is, a health problem you had before the date that new health coverage starts.These rules went into effect for plan years beginning on or after January 1, 2014.
https://www.hhs.gov/healthcare/about-the-aca/pre-existing-co...
Please don’t be one of those “if you don’t listen to me I hope you die” types; you can catch more flies with honey.