Maryland Code, Insurance § 3-112

(b)(1) The domestic mutual insurer shall mail to each member, at the member's last address of record with the domestic mutual insurer, notice of:

(2) The period within which the assessment must be paid may not be less than 20 days after notice.

(c)(1) If a member fails to pay the assessment within the period specified in the notice, the domestic mutual insurer may bring suit to collect the assessment.

(2) Failure of the member to receive the notice mailed in accordance with subsection (b) of this section is not a defense in an action to collect the assessment.