Key Points Question How did US rates of severe maternal morbidity (SMM), overall and by SMM indicator and state, change from 2012 to 2019 across the transition to International Classification… Click to show full abstract
Key Points Question How did US rates of severe maternal morbidity (SMM), overall and by SMM indicator and state, change from 2012 to 2019 across the transition to International Classification of Diseases, Tenth Revision, Clinical Modification/Procedure Coding System (ICD-10-CM/PCS) coding? Findings In this repeated cross-sectional analysis including 5.9 million delivery hospitalizations from 2012 to 2019, the national estimated rate of SMM (excluding blood transfusions) increased from 69.5 to 79.7 per 10 000 delivery hospitalizations, which was not associated with the ICD-10-CM/PCS transition. However, changes over time varied by indicator and state and some data may not be comparable across coding systems. Meaning Overall SMM rates increased between 2012 and 2019, with noted variation by indicator and state.
               
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