The department of social and health services shall seek approval from the centers for medicare and medicaid services to allow the protection of an individual's assets as provided in this chapter. The department shall adopt all rules necessary to implement the Washington long-term care partnership program, which rules shall permit the exclusion of all or some of an individual's assets in a manner specified by the department in a determination of medicaid eligibility to the extent that private long-term care insurance provides payment or benefits for services.