An administrative data merging solution for dealing with missing data in a clinical registry: adaptation from ICD-9 to ICD-10

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Abstract
We have previously described a method for dealing with missing data in a prospective cardiac registry initiative. The method involves merging registry data to corresponding ICD-9-CM administrative data to fill in missing data 'holes'. Here, we describe the process of translating our data merging solution to ICD-10, and then validating its performance.