What is the ICD‑10‑CM code for type 2 diabetes mellitus without complications?

ICD-10-CM Code for Type 2 Diabetes Without Complications

The ICD-10-CM code for type 2 diabetes mellitus without complications is E11.9.

Code Structure and Specificity

• The E11 category designates type 2 diabetes mellitus in the ICD-10-CM classification system 1
• The ".9" suffix specifically indicates type 2 diabetes without any documented complications 1
• This code should be used when a patient has confirmed type 2 diabetes but no evidence of diabetic complications affecting target organs 1

When to Use E11.9

• Use this code when the patient has type 2 diabetes characterized by insulin resistance and impaired insulin secretion, but no documented retinopathy, nephropathy, neuropathy, or other diabetic complications 2, 3
• Use this code for newly diagnosed type 2 diabetes patients who have not yet developed complications, even though the disease may have been present asymptomatically for years 4, 5
• Use this code when the medical record documents "type 2 diabetes" or "T2DM" without mention of specific complications 1

Coding Accuracy Considerations

• ICD-10-CM codes demonstrate 90.6% sensitivity and 96.3% specificity for accurately distinguishing type 2 from type 1 diabetes in electronic health records 1
• The threshold of ≥50% of encounters coded as type 2 diabetes yields 94.8% overall accuracy for diabetes type classification 1
• Consistent use of E11.9 for uncomplicated type 2 diabetes improves disease surveillance and quality monitoring in computerized registries 6

Common Coding Pitfalls to Avoid

• Do not use E11.9 if the patient has any documented diabetic complications—use the appropriate E11.x code with the specific complication suffix instead 1
• Do not confuse with E10.9 (type 1 diabetes without complications) or E13.9 (other specified diabetes without complications) 6
• Do not use "unspecified diabetes" codes when the type is clearly documented as type 2 in the medical record 6