Figure 1.

Variation in Sensitivity and Specificity of 19 Claims-Based Algorithms Developed to Identify Medicare+Choice Members Who Self-Reported They Had Hypertension, Heart Failure, or Chronic Lung Disease. (See Methods for a description of the 19 algorithms.) Points above the 45° line where the sensitivity equals one minus the specificity represent algorithms that discriminated to some degree members who did or did not report they had the condition.