Tenn. Code Ann. § 56-7-1504

Medicare supplement policies shall return to policyholders benefits that are reasonable in relation to the premium charged. The commissioner shall promulgate reasonable rules and regulations to establish minimum standards for loss ratios of medicare supplement policies on the basis of incurred claims experience, or incurred health care expenses where coverage is provided by a health maintenance organization on a service rather than reimbursement basis, and earned premiums in accordance with accepted actuarial principles and practices. Every entity providing medicare supplement policies and certificates in this state shall file annually its rates, rating schedule, and supporting documentation demonstrating that it is in compliance with the applicable loss ratio standards of this state. All filings of rates and rating schedules shall demonstrate that the actual and expected losses in relation to premiums comply with the requirements of this part.