The authority shall invoice each member for the premiums for employee benefits coverages. Premium payments are due in full within 10 days after billing. Premiums are due no later than the 10th of the month for which coverage is intended. Premium payments not received by the 10th day of the month following the due date shall be subject to an interest charge of one and one-half percent of the outstanding premium due for each month the member is overdue.
N.M. Admin. Code § 6.50.8.9