Del. Code tit. 18 § 3338B
No individual policy or contract of health insurance, or certificate issued thereunder, which is delivered, issued for delivery, renewed, modified, altered, or amended in this State by any health insurer, health service corporation or health maintenance organization that directly or indirectly covers the treatment of cancer shall limit or exclude coverage for a drug approved by the United States Food and Drug Administration by mandating that the insured shall first be required to fail to successfully respond to a different drug or drugs or prove a history of failure of such drug or drugs; provided, however that the use of such drug or drugs is consistent with best practices for the treatment of stage 4 advanced, metastatic cancer or, in the case of other cancers, the use of the drug is supported by national clinical guidelines, national standards of care, or peer reviewed medical literature for the treatment of the cancer, or in the case of targeted therapy, the target at issue.
18 Del. C. § 3338B