(a) Except as provided by Subsection (b), an insurer may not cancel during the term of a group health insurance policy or contract an individual's coverage provided by the policy or contract because the individual:
(1) has been diagnosed as having AIDS or HIV;
(2) has been treated for AIDS or HIV; or
(3) is being treated for AIDS or HIV.
(b) The insurer may cancel the coverage provided by the policy or contract for fraud or misrepresentation in the obtaining of coverage by failure to disclose a diagnosis of AIDS or an HIV-related condition.