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)