---
kind: "unit"
title: "42"
title_heading: "Public Health"
key: "chIV/subchB/part423"
level: "part"
label: "Part 423"
heading: "Voluntary Medicare Prescription Drug Benefit"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/42/chIV-subchB-part423"
sections_count: 337
---

# Part 423 — Voluntary Medicare Prescription Drug Benefit

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 — General Provisions](/cfr/42/chIV-subchB-part423-subpartA.md)
- [Subpart B — Eligibility and Enrollment](/cfr/42/chIV-subchB-part423-subpartB.md)
- [Subpart C — Benefits and Beneficiary Protections](/cfr/42/chIV-subchB-part423-subpartC.md)
- [Subpart D — Cost Control and Quality Improvement Requirements](/cfr/42/chIV-subchB-part423-subpartD.md)
- [Subpart E — Subpart E [Reserved]](/cfr/42/chIV-subchB-part423-subpartE.md)
- [Subpart F — Submission of Bids and Monthly Beneficiary Premiums; Plan Approval](/cfr/42/chIV-subchB-part423-subpartF.md)
- [Subpart G — Payments to Part D Plan Sponsors For Qualified Prescription Drug Coverage](/cfr/42/chIV-subchB-part423-subpartG.md)
- [Subpart H — Subpart H [Reserved]](/cfr/42/chIV-subchB-part423-subpartH.md)
- [Subpart I — Organization Compliance with State Law and Preemption by Federal Law](/cfr/42/chIV-subchB-part423-subpartI.md)
- [Subpart J — Coordination of Part D Plans With Other Prescription Drug Coverage](/cfr/42/chIV-subchB-part423-subpartJ.md)
- [Subpart K — Application Procedures and Contracts with Part D plan sponsors](/cfr/42/chIV-subchB-part423-subpartK.md)
- [Subpart L — Effect of Change of Ownership or Leasing of Facilities During Term of Contract](/cfr/42/chIV-subchB-part423-subpartL.md)
- [Subpart M — Grievances, Coverage Determinations, Redeterminations, and Reconsiderations](/cfr/42/chIV-subchB-part423-subpartM.md)
- [Subpart N — Medicare Contract Determinations and Appeals](/cfr/42/chIV-subchB-part423-subpartN.md)
- [Subpart O — Intermediate Sanctions](/cfr/42/chIV-subchB-part423-subpartO.md)
- [Subpart P — Premiums and Cost-Sharing Subsidies for Low-Income Individuals](/cfr/42/chIV-subchB-part423-subpartP.md)
- [Subpart Q — Guaranteeing Access to a Choice of Coverage (Fallback Prescription Drug Plans)](/cfr/42/chIV-subchB-part423-subpartQ.md)
- [Subpart R — Payments to Sponsors of Retiree Prescription Drug Plans](/cfr/42/chIV-subchB-part423-subpartR.md)
- [Subpart S — Special Rules for States-Eligibility Determinations for Subsidies and General Payment Provisions](/cfr/42/chIV-subchB-part423-subpartS.md)
- [Subpart T — Appeal Procedures for Civil Money Penalties](/cfr/42/chIV-subchB-part423-subpartT.md)
- [Subpart U — Reopening, ALJ Hearings and ALJ and Attorney Adjudicator Decisions, Council Review, and Judicial Review](/cfr/42/chIV-subchB-part423-subpartU.md)
- [Subpart V — Part D Communication Requirements](/cfr/42/chIV-subchB-part423-subpartV.md)
- [Subpart W — Medicare Coverage Gap Discount Program](/cfr/42/chIV-subchB-part423-subpartW.md)
- [Subpart X — Requirements for a Minimum Medical Loss Ratio](/cfr/42/chIV-subchB-part423-subpartX.md)
- [Subpart Y — Transitional Coverage and Retroactive Medicare Part D Coverage for Certain Low-Income Beneficiaries Through the Limited Income Newly Eligible Transition (LI NET) Program](/cfr/42/chIV-subchB-part423-subpartY.md)
- [Subpart Z — Appeals Process for Part D Program Integrity Prescription Drug Event Record Review Audits](/cfr/42/chIV-subchB-part423-subpartZ.md)
- [Subpart AA — Medicare Part D Manufacturer Discount Program](/cfr/42/chIV-subchB-part423-subpartAA.md)