The Medicaid SDP “False Plateau:” Why Hospitals May See a Surge Before the Cliff

Recent guidance from the Centers for Medicare & Medicaid Services (CMS) on Medicaid State Directed Payments (SDPs) has been widely interpreted as a tightening of federal oversight. That interpretation is correct, but incomplete. Over the past 30 days, new developments have introduced a critical nuance: hospitals may first experience a temporary surge in supplemental payments before facing a significant reimbursement contraction later this decade.

In short, the SDP era is not ending quietly. It is entering what may best be described as a “false plateau.”

CMS’s core policy remains unchanged. For rating periods beginning on or after July 4, 2025, SDPs for inpatient and outpatient hospital services are capped at 100 percent of Medicare rates in expansion states and 110 percent in non-expansion states. These limits were designed to bring consistency and fiscal discipline to a program that has grown rapidly – from just a handful of states less than a decade ago to nearly nationwide adoption today.

However, recent CMS clarifications have materially altered the near-term landscape.

Most notably, CMS has expanded the grandfathering window by interpreting eligibility timelines using “180 business days,” rather than calendar days. While seemingly technical, this shift effectively extends the deadline for qualifying SDP arrangements into early 2026. The result is a last-minute acceleration of state activity, as Medicaid agencies rush to approve or amend SDP structures before the window closes.

For hospitals, this creates an unexpected dynamic. Rather than an immediate reduction in supplemental payments, many organizations (particularly in states aggressively pursuing approvals) may see higher SDP revenue in 2026 and 2027. In some cases, payment levels may temporarily approach commercial-rate equivalents, depending on how programs are structured and approved.

But this is not a policy retreat. It is a delay.

CMS has simultaneously introduced explicit anti-circumvention language, warning states against manipulating rating periods or program structures solely to qualify for grandfathering. This signals a clear enforcement posture: while flexibility exists in the short term, future audits and compliance reviews are likely. Hospitals participating in complex or rapidly implemented SDP arrangements should anticipate increased scrutiny of documentation, actuarial support, and program intent.

The long-term trajectory remains firmly downward.

Grandfathered SDPs will begin a mandatory phase-down in 2028, with reductions occurring incrementally until payments align with Medicare-based caps. For hospitals that have become reliant on supplemental Medicaid funding, this represents a material financial risk. The combination of declining SDP revenue and already inadequate base Medicaid rates could create meaningful pressure on margins – particularly for safety-net providers and large urban systems.

This creates a strategic challenge that cannot be overstated.

Hospitals must now plan for two conflicting realities:

• Short-term revenue strength, driven by accelerated SDP approvals and expanded grandfathering; and
• Long-term reimbursement compression, as federal caps take full effect and supplemental payments are reduced.

Organizations that interpret near-term gains as a sign of policy stability risk being unprepared for the coming shift. The more prudent approach is to treat any SDP-related revenue growth over the next two years as non-recurring and transitional.

From a financial planning perspective, this requires a shift in methodology. Hospitals should begin modeling SDP revenue against Medicare-equivalent benchmarks, stress-testing scenarios where supplemental payments are reduced or eliminated, and reassessing service-line profitability under lower reimbursement assumptions.

Equally important is engagement. Providers should work closely with state Medicaid agencies to understand the structure and sustainability of current SDP programs, while ensuring that internal compliance processes are robust enough to withstand federal scrutiny.

The policy direction is clear. CMS is moving SDPs toward a more standardized, transparent, and controlled framework. But the path to that destination includes a temporary period of elevated payments – one that may obscure the severity of what comes next.

For hospital leaders, the message is simple: do not mistake the plateau for stability. The climb may feel steady today, but the edge is already in sight.