Md. Code, Health - General § 5–512

(a) A practitioner or an operator of a crematory or reduction facility may not require an authorizing agent to obtain appointment as personal representative of the decedent’s estate as a condition precedent to making final arrangements or authorizing cremation, alkaline hydrolysis, or natural organic reduction of a decedent.

(b) A person may not authorize cremation, alkaline hydrolysis, or natural organic reduction when a decedent has left instructions in a document that the decedent does not wish to be cremated or be subject to alkaline hydrolysis or natural organic reduction.