Optimising the International Classification of Diseases to identify the maternal condition in the case of perinatal death.

<bold>Objective: </bold>The WHO application of the tenth edition of the International Classification of Diseases (ICD-10) to deaths during the perinatal period (ICD Perinatal Mortality, ICD-PM) captures the essential characteristics of the mother-baby dyad that contribute to perinatal deaths. We compare the capture of maternal conditions in the existing ICD-PM with the maternal codes from the WHO application of ICD-10 to deaths during pregnancy, childbirth, and the puerperium (ICD Maternal Mortality, ICD-MM) to explore potential benefits in the quality of data received.<bold>Design: </bold>Retrospective application of ICD-PM.<bold>Setting: </bold>South Africa and the UK.<bold>Population: </bold>Perinatal death databases.<bold>Methods: </bold>The maternal conditions were classified using the ICD-PM groupings for maternal condition in perinatal death, and then mapped to the ICD-MM groupings of maternal conditions.<bold>Main Outcome Measures: </bold>Main maternal conditions in perinatal deaths.<bold>Results: </bold>We reviewed 9661 perinatal deaths. The largest group (4766 cases, 49.3%) in both classifications captures deaths where there was no contributing maternal condition. Each of the other ICD-PM groups map to between three and six ICD-MM groups. If the cases in each ICD-PM group are re-coded using ICD-MM, each group becomes multiple, more specific groups. For example, the 712 cases in group M4 in ICD-PM become 14 different and more specific main disease categories when the ICD-MM is applied instead.<bold>Conclusions: </bold>As we move towards ICD-11, the use of the more specific, applicable, and relevant codes outlined in ICD-MM for both maternal deaths and the maternal condition at the time of a perinatal death would be preferable, and would provide important additional information about perinatal deaths.<bold>Tweetable Abstract: </bold>Improving the capture of maternal conditions in perinatal deaths provides important actionable information. [ABSTRACT FROM AUTHOR]