Endocrine, Nutritional and Metabolic Diseases

ICD-10 Code: E11.65

Type 2 Diabetes Mellitus with Hyperglycemia

Type 2 diabetes mellitus with hyperglycemia represents inadequate blood glucose control in patients with established diabetes, typically defined as blood glucose levels consistently above target ranges (fasting >130 mg/dL or random >180 mg/dL) without acute metabolic decompensation.

Clinical Information

Type 2 diabetes with hyperglycemia is one of the most commonly coded diabetes complications, affecting approximately 30-40% of diabetic patients at any given time. Hyperglycemia occurs when insulin resistance and/or insufficient insulin production leads to elevated blood glucose levels above therapeutic targets. Unlike diabetic ketoacidosis (DKA) or hyperosmolar hyperglycemic state (HHS), which are acute emergencies, this code represents chronic inadequate glycemic control. Common causes include medication non-compliance, dietary indiscretion, concurrent illness, corticosteroid use, or disease progression requiring treatment intensification. Patients may present with classic hyperglycemic symptoms (polyuria, polydipsia, polyphagia, blurred vision, fatigue) or may be asymptomatic with elevated glucose discovered on routine monitoring. Persistent hyperglycemia increases risk for microvascular (retinopathy, nephropathy, neuropathy) and macrovascular (cardiovascular disease, stroke) complications.

Coding Guidelines

  • 1Use E11.65 only when hyperglycemia is documented as present during the encounter; do not use for well-controlled diabetes
  • 2This code represents chronic/poorly controlled hyperglycemia, not acute hyperglycemic crises (use E11.00 for ketoacidosis, E11.01 for hyperosmolar state)
  • 3Code first any associated insulin use (Z79.4) or oral hypoglycemic use (Z79.84) if applicable
  • 4Do not assign additional codes for symptoms that are integral to hyperglycemia (polyuria, polydipsia) unless they require separate treatment
  • 5If specific complications are documented (retinopathy, nephropathy), code those instead with their specific E11.3x or E11.2x codes
  • 6For type 2 diabetes with multiple complications, code the specific complication codes; E11.65 is used when hyperglycemia is the only documented complication

Common Uses

  • Follow-up visit for patient with uncontrolled diabetes and HbA1c >9%
  • Emergency department visit for symptomatic hyperglycemia (glucose 300-400 mg/dL) not meeting criteria for DKA/HHS
  • Inpatient encounter where diabetes management is adjusted due to persistent elevated glucose readings
  • Office visit documenting medication non-compliance resulting in hyperglycemia
  • Encounter for diabetes education due to poor glycemic control
  • Hospital admission where hyperglycemia complicates another condition (pneumonia, UTI)

Related ICD-10 Codes

E11.9Type 2 diabetes without complications (use when well-controlled)
E11.00Type 2 diabetes with hyperosmolarity without nonketotic hyperglycemic-hyperosmolar coma
E11.01Type 2 diabetes with hyperosmolarity with coma
E11.69Type 2 diabetes with other specified complication
E10.65Type 1 diabetes with hyperglycemia
Z79.4Long term use of insulin (use additional code)

Documentation Requirements

  • Physician must document 'hyperglycemia' or 'uncontrolled diabetes' or 'poorly controlled diabetes' in the medical record
  • Glucose levels should be documented (home monitoring logs, point-of-care testing, or laboratory values)
  • HbA1c value if available (generally >7-8% suggests inadequate control)
  • Current diabetes medications and compliance status
  • Absence of acute metabolic complications (DKA/HHS) if hyperglycemia is severe
  • Plan for glycemic management (medication adjustment, referral to diabetes education, dietary counseling)

Real-World Coding Examples

Patient presents with 3-month history of elevated home glucose readings 200-300 mg/dL despite metformin therapy. HbA1c 10.2%. Diagnosis: Type 2 diabetes with hyperglycemia (E11.65). Plan: Add basal insulin, diabetes educator referral.

52-year-old admitted for pneumonia. Admission glucose 285 mg/dL, patient reports running out of diabetes medications 2 weeks ago. Primary diagnosis: Pneumonia (J18.9). Secondary diagnosis: Type 2 diabetes with hyperglycemia (E11.65).

Follow-up visit for diabetes management. Patient reports polyuria and fatigue. Random glucose in office 320 mg/dL. No ketones. Diagnosis: Type 2 diabetes mellitus with hyperglycemia (E11.65). Plan: Increase glargine insulin dose.

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Medical coding for Endocrine, Nutritional and Metabolic Diseases