The C. diff (Clostridioides difficile) CMS measure is a quality metric used to track and reduce hospital‑acquired C. diff infections. It helps evaluate how well hospitals prevent infections that occur during a patient’s stay. The measure uses a Standardized Infection Ratio (SIR), which compares the number of infections that actually occurred to the number that would be expected based on national data. An SIR below 1.0 means fewer infections than expected, while an SIR above 1.0 means more.
C. diff is a bacterium that can cause severe diarrhea, inflammation of the colon, and other serious intestinal complications. It often develops after antibiotic use disrupts the balance of healthy gut bacteria, allowing C. diff to grow and release toxins. Because it spreads easily through spores, especially in healthcare settings, preventing transmission is essential to patient safety.