Except as provided in subsection (b) of this section, a health maintenance organization is not exempted from any State, county, or local taxes solely because of this subtitle. A nonprofit health maintenance organization that is exempt from taxation under § 501(c)(3) of the Internal Revenue Code is not subject to the insurance premium tax under Title 6, Subtitle 1 of the Insurance Article. Premiums received by an insurer under policies that provide health maintenance organization benefits are not subject to the premium tax imposed under Title 6, Subtitle 1 of the Insurance Article to the extent: Of the amounts actually paid by the insurer to a nonprofit health maintenance organization that operates only as a health maintenance organization; or The premiums have been paid by that nonprofit health maintenance organization.