940 CMR, § 9.04
It shall be an unfair and deceptive act or practice, in violation of M.G.L. c. 93A, § 2, for any Group Health Care Insurer to deny a Subscriber's claim for health care services or benefits on the ground that the Sponsor's Group Health Insurance Plan has been terminated for nonpayment of fees, charges, rates or premiums prior to the date on which the Subscriber or a Covered Dependent received the health care services, unless the Group Health Care Insurer has sent written notice of the termination to the Subscriber prior to the date that the health care services were received in the manner set forth in 940 CMR 9.05. A Group Health Care Insurer does not violate M.G.L. c. 93A, § 2 by denying a Subscriber's claim for services or benefits if the Sponsor or Subscriber has replaced the Group Health Insurance Plan with another insured plan or self-insured plan.
940 CMR, § 9.04