Notwithstanding subdivision (f) of Section 1345 of the Health and Safety Code, a health care service plan licensed pursuant to the Knox-Keene Health Care Service Plan Act and certified by the administrative director pursuant to Section 4600.5 to provide health care pursuant to Section 4600.3 shall be permitted to accept payment from a self-insured employer, a group of self-insured employers, or the insurer of an employer on a fee-for-service basis for the provision of such health care as long as the health care service plan is not both the health care organization in which the employee is enrolled and the plan through which the employee receives regular health benefits.