An issuer may not deliver or issue for delivery a Medicare supplement policy or certificate to a resident of this State unless the policy form or certificate form has been filed with and approved by the Commissioner in accordance with filing requirements and procedures prescribed by applicable provisions of Insurance Article, §§12-203, 12-205, and 14-126, Annotated Code of Maryland, and other applicable provisions of Insurance Article and Health-General Article, Title 19, Subtitle 7, Annotated Code of Maryland, and applicable regulations and procedures for filing for approval of forms. An issuer shall file any riders or amendments to policy or certificate forms to delete outpatient prescription drug benefits as required by the Medicare Prescription Drug, Improvement, and Modernization Act of 2003 only with the commissioner in the state in which the policy or certificate was issued. Premium Rates. An insurer may not use or change premium rates for a Medicare supplement policy or certificate unless the rates, rating schedule, methodology, and supporting documentations have been filed with and approved by the Commissioner in accordance with the filing requirements and procedures prescribed by the Commissioner. An issuer may not increase the premium rates for a Medicare Supplement policy for an insured person until: For an individual policy, at least 1 year after the date on which the individual policy became effective; and For a group policy, at least 1 year after the date on which the certificate became effective. Starting 1 year after the date on which an individual policy or certificate became effective, an issuer may not increase the premium rates for a Medicare Supplement policy for an insured person more than once each year. Filing for Approval. Except as provided in §D(2) of this regulation, an issuer may not file for approval more than one form of a policy or certificate of each type for each standard Medicare supplement benefit plan. An issuer may offer, with the approval of the Commissioner, up to four additional policy forms or certificate forms of the same type for the same standard Medicare supplement benefit plan, one for each of the following cases: The inclusion of new or innovative benefits; The addition of either direct response or agent marketing methods; The addition of either guaranteed issue or underwritten coverage; The offering of coverage to individuals eligible for Medicare by reason of disability. For the purposes of this section, a “type” means an individual policy, a group policy, an individual Medicare Select policy, or a group Medicare Select policy. Availability. Except as provided in §E(2) of this regulation, an issuer shall continue to make available for purchase any policy form or certificate form issued after the effective date of this regulation that has been approved by the Commissioner. A policy form or certificate form may not be considered to be available for purchase unless the issuer has actively offered it for sale in the previous 12 months. An issuer may discontinue the availability of a policy form or certificate form if the issuer provides to the Commissioner in writing its decision at least 30 days before discontinuing the availability of the form of the policy or certificate. After the effective date of the notice, the issuer may no longer offer for sale the policy form or certificate form in this State. An issuer that discontinues the availability of a policy form or certificate form in accordance with §E(2) of this regulation may not file for approval a new policy form or certificate form of the same type for the same standard Medicare supplement benefit plan as the discontinued form for a period of 5 years after the issuer provides notice to the Commissioner of the discontinuance. The period of discontinuance may be reduced if the Commissioner determines that a shorter period is appropriate. The sale or other transfer of Medicare supplement business to another issuer shall be considered a discontinuance for the purposes of this section. A change in the rating structure or methodology shall be considered a discontinuance under this section unless the issuer complies with the following requirements: The issuer provides an actuarial memorandum, in a form and manner prescribed by the Commissioner, describing the manner in which the revised rating methodology and resultant rates differ from the existing rating methodology and existing rates. The issuer does not subsequently put into effect a change of rates or rating factors that would cause the percentage differential between the discontinued and subsequent rates as described in the actuarial memorandum to change. The Commissioner may approve a change to the differential which is in the public interest. Basis of Experience Calculation. Except as provided in §F(2) of this regulation, the experience of all policy forms or certificate forms of the same type in a standard Medicare supplement benefit plan shall be combined for purposes of the refund or credit calculation prescribed in Regulation .11 of this chapter. Forms assumed under an assumption reinsurance agreement may not be combined with the experience of other forms for purposes of the refund or credit calculation.