Versions of CFR > Title 42 > Chapter IV > Subchapter B > Part 421 > Subpart E - Medicare Administrative Contractors (Macs) on LawServer 2024 CFR > Title 42 > Chapter IV > Subchapter B > Part 421 > Subpart E – Medicare Administrative Contractors (Macs) 2023 CFR > Title 42 > CHAPTER IV > SUBCHAPTER B > PART 421 > Subpart E – Medicare Administrative Contractors (MACs) 2022 CFR > Title 42 > Chapter IV > Subchapter B > Part 421 > Subpart E – Medicare Administrative Contractors (MACs) 2021 CFR > Title 42 > Chapter IV > Subchapter B > Part 421 > Subpart E – Medicare Administrative Contractors (MACs) 2020 CFR > Title 42 > Chapter IV > Subchapter B > Part 421 > Subpart E – Medicare Administrative Contractors (Macs) 2019 CFR > Title 42 > Chapter IV > Subchapter B > Part 421 > Subpart E – Medicare Administrative Contractors (Macs) 2016 CFR > Title 42 > Chapter IV > Subchapter B > Part 421 > Subpart E – Medicare Administrative Contractors (macs) 2015 CFR > Title 42 > Chapter IV > Subchapter B > Part 421 > Subpart E – Medicare Administrative Contractors (Macs) 2014 CFR > Title 42 > Chapter IV > Subchapter B > Part 421 > Subpart E – Medicare Administrative Contractors (Macs)