We contract with various federal and state agencies, including CMS, to provide managed health benefits services, such as Medicare Advantage, Medicare Part D, Medicare Supplement, Medicaid, TANF, SPD, LTSS, CHIP, Medicaid expansion programs and various specialty programs, products and services. We also provide various administrative services for other entities offering medical and/or prescription drug plans to their Medicaid or Medicare eligible members, and we offer employer group waiver plans which provide medical and/or prescription drug coverage to retirees. We also participate in programs in several states for the care of dual-eligible members. Regulatory reform initiatives or changes in existing laws or regulations applicable to these programs, or their interpretations, are difficult to predict and could have a material adverse effect on our business, cash flows, financial condition and results of operations.
Revenues from the Medicare and Medicaid programs are dependent, in whole or in part, upon annual funding from the federal government and/or applicable state governments, and base premium rates paid by each state or federal agency differ depending upon a combination of factors such as defined upper payment limits, a member's health status, age, gender, county or region, benefit mix, member eligibility category and risk scores. Future rates may be affected by continued government efforts to contain costs and federal and state budgetary constraints. Certain state contracts are subject to cancellation in the event of the unavailability of state funds. Additionally, ongoing CMS changes to the calculation of risk in the Medicare Advantage program may impact our federal funding. The federal government or any state in which we operate could decrease rates paid to us, pay us less than the amount necessary to keep pace with our cost trends, cancel our contracts retroactively or seek an adjustment to previously negotiated rates. In addition, various states' Medicare-Medicaid dual-eligible plans are still subject to uncertainty surrounding payment rates and other requirements, which could affect where we seek to participate in these programs. An unexpected reduction in payments, inadequate government funding or significantly delayed payments for these programs may adversely affect our business, cash flows, financial condition and results of operations.
Other potential risks associated with Medicare Advantage and Medicare Part D plans include increased medical or pharmaceutical costs, data corrections identified as a result of ongoing auditing and monitoring activities, potential uncollectability of receivables resulting from processing and/or verifying enrollment, inadequacy of underwriting assumptions, inability to receive and process correct information (including inability due to systems issues by the federal government, the applicable state government or us), uncollectability of premiums from members and limited enrollment periods. Actual results may be materially different than our assumptions and estimates and could have a material adverse effect on our business, financial condition and results of operations.
Our contracts with CMS and state governmental agencies contain certain provisions regarding data submission, risk adjustment, provider network and directory maintenance, quality measures, claims payment, timely and accurate processing of appeals and grievances, oversight of service providers, encounter data, continuity of care, call center performance and other requirements specific to federal and state program regulations. We have been subject in the past, and may again be in the future, to administrative actions, fines, penalties, liquidated damages or retrospective adjustments in payments made to our health plans as a result of a failure to comply with these requirements, which has impacted, and in the future could impact our profitability. We have experienced retroactive rate adjustments by certain state Medicaid agencies in the past, and such rate adjustments may occur in the future. Further, our state Medicaid contracts have not always been renewed, we have not always been awarded new contracts as a result of the competitive procurement process, and in some cases, we have lost members under existing contracts as a result of a post-award challenge by unsuccessful bidders, each of which could take place again in the future and have a material adverse effect on our business, cash flows, financial condition and results of operations.
The Star Rating System utilized by CMS to evaluate Medicare Advantage Plans may have a significant effect on our revenue, as higher-rated plans tend to experience increased enrollment, plans with a Star Rating of 4.0 or higher are eligible for quality-based bonus payments and plans with a Star Rating of 5.0 can market to and enroll members year-round. CMS continues to change its rating system to make achieving and maintaining a 4.0 or higher Star Rating more difficult. CMS released our 2024 Star Ratings in October 2023, which will be used to determine our Medicare Advantage plans' quality bonus payments in 2025. Based on our membership at September 1, 2023, 34% of our Medicare Advantage members were in plans with 2024 Star Ratings of at least 4.0 Stars, compared to 64% of our Medicare Advantage members being in plans with 2023 Star Ratings of at least 4.0 Stars based on our membership at September 1, 2022. This change in our 2024 Star ratings is expected to negatively impact our Medicare quality bonus payments, plan level rebates and operating revenue beginning in 2025 and our enrollment may be negatively impacted as consumers seek higher rated plans. Further, if we do not improve our Star Ratings, or if quality-based bonus payments are reduced or eliminated, we will experience further negative impact on our revenues and the benefits that our plans can offer, which could materially and adversely affect the marketability of our plans, our membership levels, results of operations, financial condition and cash flows. Similarly, if we fail to meet or exceed any performance standards imposed by state Medicaid programs in which we participate, we may not receive performance-based bonus payments or may incur penalties.
In addition, our failure to comply with federal and state healthcare laws and regulations applicable to our participation in Medicaid and Medicare programs, including those directed at preventing fraud, abuse and discrimination, could result in investigations, litigation, fines, restrictions on, or exclusions from, program participation, or the imposition of corporate integrity agreements or other agreements with a federal or state governmental agency, any of which could adversely impact our business, cash flows, financial condition and results of operations.
We are periodically subject to government audits, including CMS RADV audits of our Medicare Advantage Plans to validate diagnostic data, patient claims and financial reporting, and audits of our Medicare Part D plans by the Medicare Part D Recovery Audit Contractor ("RAC"), as well as state Medicaid RAC programs. In addition, we routinely perform ordinary course reviews of, among other things, our Medicare Advantage data submitted to CMS. These governmental audits, or changes in how these audits are conducted, including changes that may result from the final RADV Audit rule that was issued in 2023, and internal reviews, could result in reports or disclosures for prior, current or future filing years to federal or state regulatory agencies, submission of data corrections, and/or significant adjustments in payments made to our health plans and future Medicare Advantage bids, which could adversely affect our financial condition and results of operations. Additionally, state regulators are increasingly conducting audits to assess the quality of services we provide to our Medicare members. If we fail to report and correct errors discovered through our own auditing procedures, during a RADV or RAC audit or during state regulatory audits, or otherwise fail to comply with applicable laws and regulations, we could be subject to fines, civil penalties or other sanctions, which could have a material adverse effect on our ability to participate in these programs, and on our financial condition, cash flows and results of operations.
Our Medicare and Medicaid contracts are also subject to various MLR rules, including minimum MLR thresholds, rebate requirements and audits, which could adversely affect our membership and revenues if any of our state Medicare or Medicaid plans do not meet an applicable minimum MLR threshold. If a Medicare Advantage, MMP or Medicare Part D contract pays minimum MLR rebates for three consecutive years, it will become ineligible to enroll new members. If a Medicare Advantage or Medicare Part D contract pays such rebates for five consecutive years, it will be terminated by CMS.