No, not if it is a plan that must comply with the ACA. Under the ACA, insurers are not allowed to cancel (or rescind) an individual’s coverage unless that individual commits fraud or intentionally lies on his or her application for insurance. Further, insurers are no longer allowed to discriminate against any individual because of his or her health status. However, insurers may cancel coverage if a policyholder fails to pay premiums. If you believe your insurer has cancelled your coverage because of a recent diagnosis or your need for health care services, contact your state Department of Insurance. Note, there are some plans that do not comply with the ACA and may, in fact, cancel your coverage due to a recent diagnosis. See the alternative coverage section for more information. (45 C.F.R. § 147.106).