Health Maintenance Organization (HMO) A federally qualified HMO, an organization recognized as an HMO under State law, or a similar organization regulated for solvency under State law in the same manner and to the same extent as such an HMO. [45 CFR 160.103] (As defined in section 2791(b)(3) of the PHS Act, 42 U.S.C. 300gg-91(b)(3) and used in the definition of health plan in this section.) Legislation Files Containing This Term: legislation/45CFR-160.103.html legislation/45CFR-164.501.html legislation/45CFR-164.502.html legislation/45CFR-164.504.html legislation/45CFR-164.520.html