N.M. Stat. § 59A-47-40
Maximum age of dependent.
An individual or group health care coverage, including any form of self-insurance,
offered, issued or renewed under the Health Care Purchasing Act that offers coverage
of an insured's dependent shall not terminate coverage of an unmarried dependent by
reason of the dependent's age before the dependent's twenty-sixth birthday, regardless
of whether the dependent is enrolled in an educational institution.