In the 90 days prior to TJR, 4.9% (95% CI, 4.8%-5.0%) of patients without diabetes had HbA1c testing compared with 25.8% (95% CI, 25.4%-26.2%) of those with diabetes not receiving medication, 39.0% (95% CI, 38.6%-39.4%) of those with diabetes receiving noninsulin medications, and 43.4% (95% CI, 42.8%-44.1%) of those with diabetes receiving insulin. Here, INS is linked to diabetes mellitus.