; and (4) provide guidance to such State agencies with respect to State oversight of efforts by medicaid managed care organizations (as defined in section 1903(m)(1)) to assess such liability. . 6. Development of model uniform fields for States to report third party information Not later than January 1, 2018, the Secretary of Health and Human Services shall, in consultation with the States, develop and make available to the States a model uniform reporting field that States may use for purposes of reporting to the Secretary through the Transformed Medicaid Statistical Information System (T–MSIS) (or a successor system) information identifying responsible third parties (as defined in subsection (nn) of section 1902 of the Social Security Act ( 42 U.S.C. 1396a )) and other relevant information for ascertaining the legal responsibility of such third parties to pay for care and services available under the State plan (or under a waiver of the plan) under title XIX of the Social Security Act ( 42 U.S.C. 1396 et seq.). 7. Effective date (a) In general Except as provided in subsection (b) and section 2(c)(3), this Act and the amendments made by this Act (other than as specified in the preceding provisions of this Act) shall take effect on the date of enactment of this Act and shall apply to medical assistance provided on or after such date. (b) Exception if State legislation required In the case of a State plan for medical assistance under title XIX of the Social Security Act that the Secretary of Health and Human Services determines requires State legislation (other than legislation appropriating funds) in order for the plan to meet the additional requirement imposed by the amendments made under this section, the State plan shall not be regarded as failing to comply with the requirements of such title solely on the basis of its failure to meet this additional requirement before the first day of the first calendar quarter beginning after the close of the first regular session of the State legislature that begins after