Medicaid vs. Medicare Reimbursement Ratios: What They Measure and Why They Matter

If you’ve read any research or policy discussion about Medicaid provider participation, you’ve likely run into the “Medicaid-to-Medicare fee ratio” — a single number meant to summarize how competitively a state’s Medicaid program pays relative to Medicare. It’s a genuinely useful metric, but it’s also frequently cited without much explanation of what it does and doesn’t capture.

What the ratio is

For a given CPT code, the ratio divides a state’s Medicaid FFS rate by the corresponding Medicare rate (typically the non-facility rate) for the same code, expressed as a percentage. A ratio of 72% means Medicaid pays 72 cents for every dollar Medicare pays for that exact service. CMS requires states to report this ratio for a designated set of primary care and behavioral health codes as part of the Medicaid Access Rule’s comparative payment analysis.

Why researchers rely on it

Medicare rates are national, stable, and well-documented, which makes them a rare fixed point you can compare 50 different state Medicaid programs against consistently. Without a shared reference like Medicare, comparing raw Medicaid dollar amounts across states tells you less, since cost of living, program design, and billing conventions all vary independently of how “generous” a state’s reimbursement actually is.

What it doesn’t capture

The ratio is a useful signal, not a complete picture of access or adequacy, for a few reasons:

• It says nothing about managed care. Most Medicaid beneficiaries are enrolled in managed care, where actual provider payment is the MCO’s negotiated rate — not the FFS rate the ratio is built on.
• It’s code-specific, not program-wide. A ratio calculated for one E/M code doesn’t necessarily generalize to how a state reimburses across its full range of services.
• It doesn’t capture non-rate barriers to access, like provider directory accuracy, appointment availability, or administrative burden — all of which affect real-world access independent of the reimbursement rate itself.

Why it still matters

Despite those limits, the ratio remains one of the few genuinely comparable, government-verified metrics available for cross-state Medicaid analysis — which is exactly why it’s a federally mandated reporting requirement rather than an academic exercise. For actuaries, researchers, and policy analysts, it’s a reasonable starting signal for questions like “is this state’s reimbursement plausibly adequate relative to a known benchmark,” even though it shouldn’t be the only input into a conclusion about access.

Tracking it in practice

Because the ratio depends on two moving numbers — a state’s Medicaid rate and the federal Medicare rate — it can shift even when neither side has an obvious, well-publicized “change.” MedicaidBench’s Org-tier accounts can pull the current Medicaid-vs-Medicare ratio directly for the CMS-designated code set, rather than requiring a manual cross-reference between a state fee schedule and the separately published Medicare Physician Fee Schedule.