Impaired glucose tolerance (oral)

This code signifies a prediabetic state where blood glucose levels are higher than normal but not yet high enough to be diagnosed as type 2 diabetes, specifically identified through an oral glucose tolerance test (OGTT). It indicates the body's reduced ability to process glucose efficiently after a sugar load.

Apply this code when a patient's oral glucose tolerance test results fall within the impaired glucose tolerance range (e.g., 2-hour post-load glucose between 140 mg/dL and 199 mg/dL). Documentation should clearly state "impaired glucose tolerance (oral)" or provide OGTT results meeting these criteria.

• Do not use this code if the patient has a confirmed diagnosis of type 1 or type 2 diabetes.
• Distinguish from impaired fasting glucose (R73.01), which is based on fasting blood glucose levels.
• Always review the full OGTT results and physician's interpretation to ensure accurate coding.