 The profession was developed in response to the Centers for Medicare and Medicaid Services (CMS) Diagnostic-Related Group (DRG) system in 1983 and gained greater notice around 2007 with CMS's transition to Medicare-Severity Diagnosis-Related Groups.With the expansion of risk-adjusted value-based payment and quality measures and increasing accountability by regulatory agencies, CDI now impacts at least 20 different models affecting payers, facilities, and providers.CDI professionals act as intermediaries between Inpatient coders who translate diagnoses into data and healthcare providers and nurses.