Section 2. Except as hereinafter provided, a risk-bearing provider organization shall not be subject to chapters 175, 176A, 176B, 176C, 176E, 176F, 176G and 176J; provided, however, that a risk-bearing provider organization that enters into a contract with employers or individuals under which the provider organization would assume a significant portion of downside risk, as defined through division regulations, may be subject to the provisions of said chapters 175, 176A, 176B, 176C, 176E, 176F, 176G and 176J for the purposes of such contracts.