The Attorney General's regulations define unfair and deceptive acts or practices. The Attorney General's regulations are not intended to be all-inclusive as to the types of activities prohibited by M.G.L. c. 93A, §2(a), and they do not authorize acts not specifically prohibited by 940 C:MR. 9.00. 940 CMR 9.00 shall cover any Group Health Care Insurer, as defined herein, that advertises or does business in Massachusetts regardless of whether it maintains an office in Massachusetts.