Section 17A. The commission shall provide to any active or retired employee of the commonwealth who is insured under the group insurance commission coverage for nonprescription enteral formulas for home use for which a physician has issued a written order and which are medically necessary for the treatment of malabsorption caused by Crohn's disease, ulcerative colitis, gastroesophageal reflux, gastrointestinal motility, chronic intestinal pseudo-obstruction, and inherited diseases of amino acids and organic acids. Coverage for inherited diseases of amino acids and organic acids shall include food products modified to be low protein in an amount not to exceed $5,000 annually for any insured individual.