Every nonprofit hospital and medical service organization shall file with the superintendent every rate, rating formula and every modification of any of the foregoing that it proposes to use in connection with individual health insurance contracts, group Medicare supplement contracts as defined in Title 24-A, chapter 67, group nursing home or long-term care contracts as defined in Title 24-A, chapter 68 or 68-A, and certain group contracts included within the definition of “individual health plan” in Title 24-A, section 2736-C, subsection 1, paragraph C. Every filing under this subsection must state the effective date of the filing. Every filing under this subsection must be made not less than 60 days in advance of the stated effective date unless the 60-day requirement is waived by the superintendent for a period of time not to exceed 30 days.