Within the treatment period referred to in paragraph (d)(2) of this section, the specialist shall be permitted to treat the insured without a further referral from the insured's network provider and may authorize such further referrals, procedures, tests and other medical services as the individual's network provider would otherwise be permitted to provide or authorize, provided that such further referrals, procedures, tests and other medical services are part of treating the patient for the condition for which the patient was referred to the specialist. Referrals, procedures, tests and other medical services referred to in this subsection shall be provided by network providers unless such services are not available through network providers, or the network providers are not available within a reasonable period of time. If services are not available through network providers, or the network providers are not available within a reasonable period of time, the out-of-network provider shall be reimbursed at an agreed-upon or negotiated rate. In such circumstances, the non-network provider may not balance bill the insured.
18 Del. C. § 3564