Braidwood Management, Inc. v. Becerra challenges the Affordable Care Act free preventive coverage guarantee. Community health centers serve over 30 million residents of medically underserved urban and rural communities. Their limited federal grant funding makes them reliant on insurance revenue for their operations, Medicaid and subsidized marketplace coverage in particular, both of which are implicated by the case. To understand these implications, we developed an analytic model that crosswalks the preventive services potentially affected by Braidwood and the preventive care that all health centers must furnish. Of the 193 preventive services now covered under the guarantee, only forty-eight would survive were the Braidwood plaintiffs to prevail. In underserved communities, health centers are a principal source of the nearly 150 affected services, as evidenced by the care they are required to furnish under federal law, the quality metrics they are expected to meet, and the health diagnoses and treatments identified in federal performance reporting requirements. Thus, the impact on access, quality, patient health, and health center finances and care capability will likely be substantial.