What HbA1c range indicates poorly controlled diabetes?

According to the American Diabetes Association (ADA) and CMS/NCQA quality measures (eCQI Measure CMS122), an HbA1c level above 9.0% indicates poorly controlled (uncontrolled) diabetes. HbA1c values of 8.0–8.5% may indicate suboptimal control, but the established clinical threshold for 'poorly controlled' is >9.0%. Patients with HbA1c >9% are at significantly higher risk of hyperglycemia-related complications and require more intensive management before elective dental procedures.