Except as provided in Section 6 [59A-23D-6 N.M. Stat. Ann.] of this act, employer and employee contributions to medical care savings accounts established pursuant to the Medical Care Savings Account Act [N.M. Stat. Ann. Chapter 59A, Article 23D], the interest earned on those accounts and money reimbursed to an employee for eligible medical expenses from those accounts or money advanced to the employee by the employer for eligible medical expenses pursuant to that act are exempt from taxation.