42 CFR § 438.116 - Solvency standards.
(a) Requirement for assurances.
(1) Each MCO, PIHP, and PAHP that is not a Federally qualified HMO (as defined in section 1310 of the Public Health Service Act) must provide assurances satisfactory to the State showing that its provision against the risk of insolvency is adequate to ensure that its Medicaid enrollees will not be liable for the MCO's, PIHP's, or PAHP's debts if the entity becomes insolvent.
(2) Federally qualified HMOs, as defined in section 1310 of the Public Health Service Act, are exempt from this requirement.
(b) Other requirements -
(1) General rule. Except as provided in paragraph (b)(2) of this section, an MCO or PIHP, must meet the solvency standards established by the State for private health maintenance organizations, or be licensed or certified by the State as a risk-bearing entity.
(ii) Is a public entity.
(iii) Is (or is controlled by) one or more Federally qualified health centers and meets the solvency standards established by the State for those centers.
(iv) Has its solvency guaranteed by the State.