---
kind: "unit"
title: "42"
title_heading: "Public Health"
key: "chIV/subchB/part421"
level: "part"
label: "Part 421"
heading: "Medicare Contracting"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/42/chIV-subchB-part421"
sections_count: 33
---

# Part 421 — Medicare Contracting

Title 42 C.F.R. — Public Health › Chapter IV — Centers for Medicare & Medicaid Services, Department of Health and Human Services › Subchapter B — Medicare Program

## Contents

- [Subpart A — Scope, Definitions, and General Provisions](/cfr/42/chIV-subchB-part421-subpartA.md)
- [Subpart B — Intermediaries](/cfr/42/chIV-subchB-part421-subpartB.md)
- [Subpart C — Carriers](/cfr/42/chIV-subchB-part421-subpartC.md)
- [Subpart D — Medicare Integrity Program Contractors](/cfr/42/chIV-subchB-part421-subpartD.md)
- [Subpart E — Medicare Administrative Contractors (MACs)](/cfr/42/chIV-subchB-part421-subpartE.md)
- [Subpart F — Subpart F [Reserved]](/cfr/42/chIV-subchB-part421-subpartF.md)