Use of explicit ICD9-CM codes to identify adult severe sepsis: impacts on epidemiological estimates.

A decreasing trend in mortality was observed in both cohorts though the APC was −8.1 % (95 % CI −10.4, −5.7) in the combination code cohort and −3.5 % (95 % CI −3.9, −3.2) in the explicit code cohort.

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In addition, the implementation of these explicit codes, especially code 995.92, had an increasing trend over the six-year study period.

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