Except as provided in par. (am), a disability insurance policy that covers injected or intravenous chemotherapy and oral chemotherapy, or a self-insured health plan that covers injected or intravenous chemotherapy and oral chemotherapy, may not require a higher copayment, deductible, or coinsurance amount for oral chemotherapy than it requires for injected or intravenous chemotherapy, regardless of the formulation or benefit category determination by the policy or plan.