N.M. Code R. § 13.19.2.9
B. Combinations of primary coverage and excess coverage shall not be considered a violation of this section if the excess insurance is written by an eligible surplus lines insurer:
(1) because of a refusal in writing by the primary authorized insurer to assume the limits of liability desired by the person seeking insurance; or
(2) on a written demand, including specific reasons, by the person seeking insurance that the entire liability not be placed with one insurance company.
[1/1/99; Recompiled 11/30/01]