Maryland Labor and Employment Section 9-601

      A provision of this subtitle may not be construed to change:

            (1)      a law relating to an accidental personal injury or an occupational disease, that occurred before the effective date of the provision and for which a claim is made under this title; or

            (2)      the payment basis in effect when an accidental personal injury or an occupational disease, for which a claim is made under this title, occurred.