N.M. Admin. Code § 8.308.2.17
The MCO shall notify HSD within five calendar days of unexpected changes to the composition of its provider network that would have an effect on member access to services or on the MCOs ability to deliver services included in the benefit package. Anticipated material changes in the MCO provider network shall be reported in writing to HSD within 30 calendar days prior to the change or as soon as the MCO becomes aware of the anticipated change. For both expected and unexpected changes in the network, the MCO shall be required to assess the significance of the change or closure to the network and shall submit a notification narrative and specific transition plans, if applicable, as detailed in the MCO policy manual.
N.M. Admin. Code § 8.308.2.17