Md. Code, Labor and Employment § 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.