N.M. Stat. § 27-2-12.3

The human services [health care authority] department shall establish a rate for the reimbursement of physicians, dentists, optometrists, podiatrists and psychologists for services rendered to medicaid patients that provides equal reimbursement for the same or similar services rendered without respect to the date on which such physician, dentist, optometrist, podiatrist or psychologist entered into practice in New Mexico, the date on which the physician, dentist, optometrist, podiatrist or psychologist entered into an agreement or contract to provide such services or the location in which such services are to be provided in the state; provided, however, that the requirements of this section shall not apply when the human services [health care authority] department contracts with entities pursuant to Section 27-2-12.6 NMSA 1978 to negotiate a rate for the reimbursement for services rendered to medicaid patients in the medicaid managed care system.