Under any student accident coverage, regardless of the form of the contract, no provision may be included that reduces the benefits payable on account of the existence of group or individual insurance contracts that provide health insurance coverage on the student; provided, that this section does not apply to any student accident coverage where the school or institution is the policyholder and pays one hundred percent (100%) of the premium for the policy, without receipt of any premium contribution from any individual insured, parent or guardian.