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Abstract

The objective of this study was to demonstrate the impact of a single ICD-9 (International Statistical Classification of Diseases and Related Health Problems, Version 9) code on the observed-to-expected mortality ratios for acute care hospitals, calculated using administrative data. The study was a retrospective analysis of mortality data and prospective measurement of the impact of a change in coding on expected mortality rates. Measurement included overall mortality observed-to-expected mortality index for 2 hospitals and rate of use of the palliative care ICD-9 code. The main result was that both retrospective and prospective applications of this single ICD-9 code significantly reduced observed-to-expected mortality ratios. Both regulators and hospitals need to be aware of the impact of the quality of coding on publicly reported quality and patient safety data.

Keywords

quality outcomes mortality coding

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Mortality Rates as a Measure of Quality and Safety,“Caveat Emptor”

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