AN-DRG allocation must rely on mappings between ICD-9-CM and ICD-10-AM. Mappings for grouping purposes are known as "logical" mappings, while those for longitudinal epidemiological studies are called "historical" mappings. The slight differences between these mappings arise because of differences in specificity of the classifications, especially in situations where one code in the new classification maps to many codes in the previous classification, and the many codes are spread over many DRGs
Construction of casemix classifications requires data expressed in the source coding systems. Because the national casemix classification system, AN-DRG, has until now been based on the previous standard classification in Australia, ICD-9-CM, the changeover to ICD-10-AM will require mapping between the classifications so that a version of AN-DRG based on ICD-10-AM can be built
AN-DRG allocation must rely on mappings between ICD-9-CM and ICD-10-AM. Mappings for grouping purposes are known as "logical" mappings, while those for longitudinal epidemiological studies are called "historical" mappings. The slight differences between these mappings arise because of differences in specificity of the classifications, especially in situations where one code in the new classification maps to many codes in the previous classification, and the many codes are spread over many DRGs
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