Z79.4
Long term (current) use of insulin
Factors influencing health status and contact with health services Not Billable (Secondary Code)
Quick Reference
Patient with Type 2 diabetes using insulin long-term
Clinical Information
When to Use This Code
Patient with Type 2 diabetes using insulin long-term
Common Clinical Scenarios
- Type 2 diabetic requiring insulin
- Basal-bolus insulin regimen
- Insulin pump therapy
- Long-acting insulin with oral agents
Documentation Requirements
- Document insulin regimen (type, dose, frequency)
- Specify if basal only, basal-bolus, or insulin pump
- Note reason for insulin use in Type 2 diabetes
- Record glucose control and HbA1c
Coding Guidelines
Inclusion Terms
These terms are included in this code:
Insulin therapyChronic insulin useLong-term insulin
Exclusion Terms
Do NOT use this code for:
- Type 1 diabetes (all patients use insulin, no Z79.4 needed)
- Short-term insulin use (hospitalization)
Coding Notes
Only use with Type 2 diabetes (E11.-), not Type 1
Type 1 diabetics always use insulin by definition
Important for HCC risk adjustment in Medicare Advantage
Related ICD-10 Codes
Consider these related codes based on patient presentation:
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Code
Z79.4
Category
Factors influencing health status and contact with health services
Billable Status
Not Billable
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