Mass. Gen. Laws ch. 176A § 8S
Any contract between a subscriber and the corporation under an individual or group hospital service plan delivered, issued or renewed in the commonwealth shall provide, as benefits to all individual subscribers and members within the commonwealth and to all group members having a principal place of employment within the commonwealth for services rendered by a certified registered nurse anesthetist or nurse practitioner designated as such certified registered nurse anesthetist or nurse practitioner by the board of registration in nursing pursuant to the provisions of section eighty B of chapter one hundred and twelve; provided, however, that the following conditions are met: (1) the service rendered is within the scope of the certified registered nurse anesthetist's license or nurse practitioner's authorization to practice by the board of registration in nursing; and (2) the policy or contract currently provides benefits for identical services rendered by a provider of health care licensed by the commonwealth.
Mass. Gen. Laws ch. 176A, § 8S