Amend CSSB 383 in Section 7, Article 3.70-3C, Insurance Code, as added by SECTION 1 of the bill (page 15, between lines 15 and 16, House Committee Printing), by inserting Subsection (f) to read as follows: (f) An insurer or preferred provider that uses a drug formulary in providing a prescription drug benefit shall provide the benefit to an insured for a drug not included in the formulary if: (1) the drug not included in the formulary is in a class of drugs covered under the prescription drug benefit; (2) a physician treating the insured under the preferred provider benefit plan determines that prescription of the drug not included in the formulary, rather than a drug included in the formulary, is in the best interest of the insured; and (3) the enrollee pays the difference between the costs of the drugs, if the drug that is not included in the formulary is more expensive than the drug that is include in the formulary.