E11.9
Type 2 diabetes mellitus without complications
Type 2 diabetes mellitus (T2DM) is a chronic metabolic condition characterized by insulin resistance and relative insulin deficiency, leading to persistently elevated blood glucose levels. The code E11.9 is designated for patients with a confirmed diagnosis of T2DM who do not currently exhibit any documented manifestations of diabetic complications, such as nephropathy, neuropathy, retinopathy, or peripheral vascular disease. Clinical management typically focuses on glycemic control through lifestyle modifications, oral antihyperglycemic medications, and occasionally insulin therapy. This code serves as the default for T2DM when the physician does not specify a complication.
Clinical Symptoms
- Increased thirst (polydipsia)
- Frequent urination (polyuria)
- Increased hunger (polyphagia)
- Unexplained weight loss
- Fatigue
- Blurred vision
- Slow-healing sores
- Frequent infections
Common Causes
- Insulin resistance in muscle, liver, and adipose tissue
- Progressive beta-cell dysfunction and insulin secretory deficiency
- Obesity and excess visceral fat
- Physical inactivity and sedentary lifestyle
- Genetic predisposition and family history
- Advancing age
- History of gestational diabetes
Documentation & Coding Tips
Explicitly state 'Type 2' to ensure correct categorization and avoid confusion with Type 1 diabetes (E10.-).
Example: 'Patient has stable Type 2 DM controlled with diet.'
Only use E11.9 if no complications are documented; if any organ system involvement is present, a more specific code from the E11 category must be selected.
Example: 'If the patient has diabetic chronic kidney disease, code E11.22 instead of E11.9.'
Report long-term use of insulin or oral medications using supplementary status codes from the Z79 series.
Example: 'Assign Z79.4 for long-term insulin use or Z79.84 for long-term oral hypoglycemic use alongside E11.9.'