Medicare DSH Worksheet S-10 and the OBBBA: Strategic Financial Considerations for Hospital CFOs

Medicare Disproportionate Share Hospital (DSH) payments remain a critical revenue stream for hospitals serving high numbers of low-income patients. With recent changes introduced under the One Big Beautiful Bill Act (OBBBA), the role of Worksheet S-10 has taken on increased strategic and financial importance for hospital leaders.

Worksheet S-10 is the primary mechanism CMS uses to measure uncompensated care costs, which directly influence how Medicare DSH uncompensated care payments are distributed. As policy shifts place greater scrutiny on how these costs are calculated and reported, accuracy and consistency are no longer compliance exercises — they are margin drivers.

Why Worksheet S-10 Matters More Than Ever
The OBBBA reinforces CMS’s reliance on S-10 data to allocate DSH uncompensated care payments. Hospitals with incomplete, inconsistent, or poorly supported S-10 submissions face heightened risk of payment reductions, audit findings, or unfavorable settlement outcomes.

For CFOs, this elevates Worksheet S-10 from a cost report line item to a strategic financial lever. The way charity care, non-Medicare bad debt, and other uncompensated care components are defined, documented, and reconciled can materially affect future DSH payments.

Key Areas of Financial Risk and Opportunity
Hospitals should pay particular attention to:

• Charity care policy alignment — ensuring financial assistance policies are applied consistently and documented clearly across departments
• Cost-to-charge ratio accuracy — confirming that uncompensated care costs are calculated using defensible, auditable methodologies
• Data integrity and reconciliation — aligning patient accounting systems, general ledger data, and cost report reporting
• Audit readiness — maintaining supportable documentation in anticipation of MAC or CMS review

Small variances or classification errors can cascade into significant DSH payment impacts, particularly as CMS continues to refine its uncompensated care methodology.

Strategic Implications for Hospital Finance Leaders

The OBBBA underscores a broader trend: federal reimbursement policy increasingly rewards hospitals that treat reporting, compliance, and data governance as strategic functions. CFOs should evaluate whether internal controls, cross-functional workflows, and external advisory support are sufficient to protect DSH revenue in this evolving environment.

Proactive review — rather than reactive correction — positions hospitals to:

• Protect uncompensated care reimbursement
• Reduce audit exposure
• Improve forecasting reliability
• Support long-term margin stability

Alliant Support for Members
As reimbursement policy continues to evolve, Worksheet S-10 accuracy is inseparable from financial performance. Alliant supports member organizations by helping finance leaders assess reporting practices, identify risk areas, and align uncompensated care strategies with broader reimbursement and margin improvement goals — ensuring hospitals are positioned to respond confidently to regulatory change.