The bill aims to renew and expand the application of the Medicare payment rate floor for primary care services provided under the Medicaid program. This provision ensures that Medicaid payments for these services are set at a rate not less than 100 percent of the Medicare Part B rate, or a higher rate based on 2009 Medicare conversion factors, thereby enhancing access to primary care for beneficiaries. A key aspect of the legislation is the significant expansion of eligible primary care providers. This includes physicians specializing in obstetrics and gynecology and certain subspecialties, provided they are board-certified, as well as advanced practice clinicians supervised by qualified professionals. The enhanced payment also covers services provided by rural health clinics, Federally-qualified health centers , and other clinics, and ensures that nurse practitioners, physician assistants, and certified nurse-midwives receive payments comparable to Medicare Part B. To ensure proper implementation, the bill clarifies that primary care services provided in a hospital emergency department are excluded from this enhanced payment definition. It further mandates that Medicaid managed care entities must ensure their contracts provide payments to these primary care providers at rates consistent with the Medicare payment floor, requiring documentation for compliance. Finally, the legislation directs the Secretary of Health and Human Services to conduct a comprehensive study within 13 months of enactment. This study will compare Medicaid enrollment and provider participation before and after the policy's implementation, and analyze primary care payment rates across states using specific indexes.