an Indian tribe, tribal organization, or urban Indian organization, see section 1139(c) of the Social Security Act ( 42 U.S.C. 1320b–9(c) ). . 157. Access to Federal insurance Title IV of the Indian Health Care Improvement Act ( 25 U.S.C. 1641 et seq.) (as amended by section 156) is amended by adding at the end the following: 409. Access to Federal insurance Notwithstanding the provisions of title 5, United States Code, Executive order, or administrative regulation, an Indian tribe or tribal organization carrying out programs under the Indian Self-Determination and Education Assistance Act ( 25 U.S.C. 450 et seq.) or an urban Indian organization carrying out programs under title V of this Act shall be entitled to purchase coverage, rights, and benefits for the employees of such Indian tribe or tribal organization, or urban Indian organization, under chapter 89 of title 5, United States Code, and chapter 87 of such title if necessary employee deductions and agency contributions in payment for the coverage, rights, and benefits for the period of employment with such Indian tribe or tribal organization, or urban Indian organization, are currently deposited in the applicable Employee’s Fund under such title. . 158. General exceptions Title IV of the Indian Health Care Improvement Act ( 25 U.S.C. 1641 et seq.) (as amended by section 157) is amended by adding at the end the following: 410. General exceptions The requirements of this title shall not apply to any excepted benefits described in paragraph (1)(A) or (3) of section 2791(c) of the Public Health Service Act ( 42 U.S.C. 300gg–91 ). . 159. Navajo Nation Medicaid Agency feasibility study Title IV of the Indian Health Care Improvement Act ( 25 U.S.C. 1641 et seq.) (as amended by section 158) is amended by adding at the end the following: 411. Navajo Nation Medicaid Agency feasibility study (a) Study The Secretary shall conduct a study to determine the feasibility of treating the Navajo Nation as a State for the purposes of title XIX of the Social Security Act ,