The department of health and senior services shall develop flexible assessment procedures for individuals in long-term care and those considering long-term care services which follow the individual through the continuum of care, including periodic reassessment. By January 1, 2002, the department of health and senior services shall promulgate rules and regulations to implement the new assessment system and shall make a report to the appropriate house and senate committees of the general assembly regarding the new assessment system. Any rule or portion of a rule, as that term is defined in section 536.010, that is created under the authority delegated in this section shall become effective only if it complies with and is subject to all of the provisions of chapter 536 and, if applicable, section 536.028. This section and chapter 536 are nonseverable and if any of the powers vested with the general assembly pursuant to chapter 536 to review, to delay the effective date or to disapprove and annul a rule are subsequently held unconstitutional, then the grant of rulemaking authority and any rule proposed or adopted after August 28, 1999, shall be invalid and void.