"On the OB Side of Things, It's Completely Disconnected": Early Implementation of Medicaid Accountable Care Organizations and Health Care in the Perinatal Period.

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More than 40% of U.S. birthing people are covered by Medicaid. Accountable Care Organizations (ACOs) are increasingly common in state Medicaid programs and may influence maternal health, quality of care, and outcomes. However, there has been limited examination of how Medicaid ACOs operate in the context of perinatal care. Our objective was to explore how individuals in ACO leadership have approached program design to address maternal health and how these programs have shaped health care utilization and maternal health from the perspective of postpartum ACO beneficiaries and clinicians. We conducted virtual semi-structured interviews with three key stakeholder groups in Massachusetts (ACO leaders, maternity care clinicians, and Medicaid ACO members who had given birth within the past 6-24months) between November 2021 and May 2023. Purposive sampling aimed to achieve variation in geographic location (members and clinicians) and race/ethnicity (members). Interviews were recorded, professionally transcribed, and analyzed iteratively using thematic analysis. Thirty-three interviews were conducted: four with ACO leaders, 15 with maternity care clinicians, and 14 with ACO members. Maternity care clinicians did not perceive that ACO implementation had substantially impacted perinatal health care. Interviews with ACO leadership suggested that the lack of perceived impact may be partially explained by competing priorities; the Massachusetts Medicaid ACOs generally did not focus on maternal health during the initial implementation period. Postpartum ACO members were largely unaware of ACOs. Lack of explicit attention to the perinatal population in Medicaid financing and delivery system reforms may reduce the potential impact in improving outcomes.