Cost of Non-Adherence Calculator
See how medication adherence affects your A1c - and the projected additional healthcare costs from poor adherence over 1, 5, and 10 years.
Educational estimator only - not medical advice.
Typical target: <7.0% for most adults with Type 2, <7.5% for Type 1
Include medications, supplies, visits, and testing
Non-adherence to diabetes medications is associated with elevated HbA1c, which in turn correlates with higher complication rates and healthcare costs. The model uses published estimates from diabetes health economics literature:
>90% adherent -> baseline (no adjustment)
75-90% adherent -> +0.3% A1c above baseline
50-75% adherent -> +0.8% A1c above baseline
<50% adherent -> +1.5% A1c above baseline
Additional annual cost per 1% A1c above target:
Conservative estimate: EUR1,500/year
High estimate: EUR3,000/year
Projected extra cost =
A1c impact x cost per 1% A1c x years
The line chart shows cumulative total cost over 10 years for a fully adherent patient versus your current adherence rate - illustrating the compounding financial impact of poor control.
| Adherence | Zone | Est. A1c Impact | Extra Annual Cost* |
|---|---|---|---|
| >90% | Excellent | None | EUR0 |
| 75-90% | ! Moderate | +0.3% A1c | EUR450-EUR900 |
| 50-75% | Poor | +0.8% A1c | EUR1,200-EUR2,400 |
| <50% | Critical | +1.5% A1c | EUR2,250-EUR4,500 |
*Estimates based on EUR1,500-EUR3,000 additional annual cost per 1% A1c elevation above target, from diabetes health economics literature. Does not include indirect costs (lost productivity, quality of life).
- Complications compound: Each 1% elevation in A1c increases risk of retinopathy by 25-30%, nephropathy by 25%, and cardiovascular events by 15-18%. Treating these complications costs far more than the medications avoided.
- Emergency visits: Poor glycaemic control is the leading cause of preventable diabetic ketoacidosis (DKA) and hypoglycaemic hospitalisations, each costing EUR2,000-EUR15,000+.
- Medication simplification: If side effects or complexity are driving non-adherence, speak with your doctor about once-daily formulations, combination pills, or alternative medications with better tolerability profiles.
- Pill organisers & reminders: Simple adherence tools - weekly pill boxes, phone alarms, or medication management apps - have been shown to improve adherence rates by 15-25% in clinical trials.
- Pharmacy auto-refill: Running out of medication is a major driver of unintentional non-adherence. Auto-refill programmes ensure continuity without requiring active management.
- Behavioural support: Diabetes care coaches, diabetes educators, and peer support groups address the psychological barriers to adherence - including fatigue, denial, and burnout - with demonstrated cost-effectiveness.
Chapter 20 of the FOD Mature guide explores the long-term financial and health consequences of diabetes management decisions, including the true cost of skipping medications and strategies to stay consistent without burnout.
FOD Mature - Ch. 20 ->This calculator uses general estimates from published health economics research and is intended for educational purposes only. The relationship between medication adherence, A1c, and costs varies significantly between individuals based on medication type, diabetes duration, comorbidities, insurance coverage, and geography. Cost projections are illustrative estimates - not medical or financial advice. Always consult your healthcare provider and diabetes care team regarding your personal management plan and never stop or alter medications without professional guidance.