Md. Code, Estates and Trusts § 5–402

A proceeding for judicial probate shall be instituted at any time before administrative probate or within the period after administrative probate provided by § 5–304 of this title:

(1) At the request of an interested person;

(2) By a creditor in the event that there has been no administrative probate;

(3) If it appears to the court or the register that the petition for administrative probate is materially incomplete or incorrect in any respect;

(4) If the will has been torn, mutilated, burned in part, or marked in a way as to make a significant change in the meaning of the will; or

(5) If it is alleged that a will is lost or destroyed.