The number of diagnosis codes has expanded from 13,000 ICD-9 codes to 68,000 ICD-10 codes, with 78 percent of ICD-9 diagnosis codes mapping 1-to-1 with an ICD-10 code, either exactly or approximately.
ICD-9 codes 433.X1, 434, and V12.54 demonstrated high PPVs for identifying confirmed cerebral events across care settings. Codes recorded in both inpatient and outpatient settings had higher PPVs but ...
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