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Kuhle S, Kirk SF, Ohinmaa A, Veugelers PJ (2011)

Objective: To investigate the sensitivity and specificity of an ICD code-based diagnosis of obesity from administrative health data relative to the gold standard measured BMI.
Results: The sensitivity of an ICD code-based obesity diagnosis was 7.4% using ICD codes between 2002 and 2004. Those correctly identified had a higher BMI and had higher health care utilization and costs.
Additional Information: http://www.biomedcentral.com/1471-2288/11/173/