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Fig. 1 | BMC Health Services Research

Fig. 1

From: Comprehensive review of ICD-9 code accuracies to measure multimorbidity in administrative data

Fig. 1

Structured Literature Review Flow Diagram. *We prioritize the articles with the following: 1) chart abstraction as gold standard; 2) self-report, disease registry, or disease screening as gold standard; 3) systematic review. We excluded articles with an algorithm including other criteria than just ICD-9 codes, such as ICD-10 codes, ICD-8 codes, Current Procedural Technology (CPT) codes, lab results, or medications, and those validating ICD-9 codes for multiple conditions in a comorbidity index (e.g., Charlson comorbidity index)

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