Mass. Gen. Laws ch. 175, § 108D

Whenever any policy, contract, agreement, plan or certificate of insurance, including any self-insured sickness, health or welfare plan issued within or without the commonwealth provides for reimbursement for any service which is within the lawful scope of practice of a chiropractor licensed under the provisions of chapter one hundred and twelve, the insured or other person entitled to benefits under such policy, contract, agreement, plan or certificate shall be entitled to reimbursement for such services, whether such services are performed by a medical physician or a chiropractor licensed by the commonwealth, notwithstanding any provision contained in such policy, contract, agreement, plan or certificate to the contrary.