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Can I sue a private health insurance company if they reject me for coverage, when I used to be a member?

Rooster/Blaster asked: Any lawyers in the field of malpractice, health insurance, or negligence: I would love to hear from you on this matter.
This is my situation. I am 31 years old, a FT student, with a disability due to OCD. I was under my Mother’s policy with Kaiser Permanente for the past some twenty years [...]