The CMS (Centers for Medicare and Medicaid Services) developed the National Correct Coding Initiative (NCCI) to promote national correct coding methodologies and to control improper coding leading to inappropriate payment in Part B claims. The CMS developed its coding policies based on coding conventions defined in the American Medical Association’s CPT manual, national and local policies and edits, coding guidelines developed by national societies, analysis of standard medical and surgical practices, and a review of current coding practices. The CMS annually updates the National Correct Coding Initiative Coding Policy Manual for Medicare Services (Coding Policy Manual). The Coding Policy Manual should be utilized by carriers and FIs (Fiscal Intermediaries) as a general reference tool that explains the rationale for NCCI edits.
Carriers implemented NCCI edits within their claim processing systems for dates of service on or after January 1, 1996.
More information from CMS here.