Md. Code, Insurance § 19–509.2

(a) A final judgment in an action for personal injury protection coverage under a motor vehicle liability insurance policy does not preclude a subsequent action for uninsured or underinsured motorist coverage arising out of the same motor vehicle accident or occurrence.

(b) A final judgment in an action for personal injury protection coverage under a private passenger motor vehicle liability insurance policy does not preclude a subsequent action for enhanced underinsured motorist coverage arising out of the same motor vehicle accident or occurrence.