"If adopted as drafted, these rules will significantly impact how Medicare Advantage (MA) organizations and Part D Prescription Drug Plan (PDP) sponsors operate and interact with their contractors, beneficiaries, and the government. The proposed rules will also impact the operations of all health care entities involved in providing drug products under Parts C and D, including pharmacy benefit managers (PBMs), pharmacies, physicians, and pharmaceutical manufacturers. Impacted parties and entities will want to carefully review the text of the proposed rules, along with CMS's justification for the rules, and consider submitting comments by the deadline."