STATE LAW – NEW MEXICO LIBRARY – GUIDE 06
New Mexico Stacking & Multiple Insurance Policies
Stacking analysis asks whether more than one independently applicable coverage may respond to the same loss. New Mexico UM/UIM law makes policy structure, insured status, rejection documents and anti-stacking provisions especially important.
- Identify every potentially applicable policy and limit.
- Determine whether each policy independently covers the claimant and occurrence.
- Review anti-stacking, other-insurance and anti-duplication provisions.
- Apply current New Mexico statutes and controlling appellate authority.
Stacking is strongly protected unless validly waived
New Mexico has a strong public policy favoring stacking of UM/UIM coverage when separate premiums support multiple coverages. An insurer seeking to prohibit stacking must obtain a valid written waiver and satisfy New Mexico’s disclosure requirements.
Montano and Ullman define the waiver requirements
Montano v. Allstate requires a written rejection of stacking, and Ullman v. Safeway requires the offer to explain stacking sufficiently for an informed election and to provide a meaningful opportunity to obtain more information.
Garcia confirms enforceability of a valid waiver
In Garcia v. Allstate (2025), the New Mexico Supreme Court held that a valid written anti-stacking election was enforceable where the offer explained stacked and non-stacked coverage and the later declarations did not create ambiguity.
PUBLIC-INTEREST LEGAL EDUCATION
VictimsGuide does not provide legal services or create an attorney-client relationship. Insurance requirements, deadlines, remedies and controlling authority can change. Verify current primary authority, policy language and the law applicable to the particular event before legal reliance.
Official Sources
Verify current New Mexico law at the source
The reviewed New Mexico guide content above is preserved. Use current statutes, insurance regulation, controlling cases and the operative policy before legal reliance.