For the purpose of determining the rate of any policy within a closed block of business, the superintendent may require an insurer to pool the experience of a closed block of business with all appropriate blocks of business that are not closed in accordance with Section 59A-18-13.1 NMSA 1978. An insurer shall not apply a rate penalty or surcharge beyond that which reflects the experience of a pool combined in accordance with this section.
NMS § 59A-18-13.6