Brit in the US with pre-existing condition. What about health insurance?

I am American (29 years old), living in the UK with my British husband (39 years old). We are looking into relocating (going back, for me) to the US. The only thing holding us back at this point is health insurance. I would be fine with employer provided group insurance. My husband is not only British, but he also has a pre-existing condition known as Polymyositis. He is in perfectly good health, otherwise and is on a single medication once a week to control his disease.
Being that he has this, the main condition of our being able to relocate is that he must have health insurance as soon as possible when we do move over, which would mean an individual policy, as far as I can tell, which we don't mind at all paying for. So my question is basically, is this possible? Will anyone cover him? And if so, would there be a time period in which he would need to be resident in the US prior to coverage starting? Also, approximately what would be the cost of something like that? Thanks!

health insurance is expensive here,try to call to U S and a health plan,say kaiser maybe ask them questions.

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