Coinsurance in health insurance is the percentage of a medical bill that you must pay after you have met your deductible. The insurance company pays the remaining percentage according to the policy terms.
In simple terms, coinsurance means you share the cost of treatment with the insurer after crossing a defined threshold.
In India, coinsurance in health insurance is commonly seen in senior citizen policies, certain top-up plans, and group health insurance policies.
Simple Example of Coinsurance
If your coinsurance is 20%, you pay 20% of the medical bill, and the insurer pays 80%.
Example:
- Coinsurance: 20%
- Hospital bill: ₹1,00,000
You pay ₹20,000
Insurance pays ₹80,000
However, coinsurance usually applies only after meeting your deductible.
How Coinsurance Works in Health Insurance
Coinsurance generally applies to:
- Hospitalisation
- Surgeries
- Major treatments
- High-value medical bills
Unlike a copay, coinsurance is not a fixed amount. Your payment depends on the total cost of treatment.
Step-by-Step Process
In most health insurance plans:
- You first pay the deductible (if applicable).
- After the deductible is fully paid, coinsurance applies.
- The insurance company pays the remaining percentage.
👉 Coinsurance does not apply until the deductible is fully paid.
To understand this better, read our guide on deductible in health insurance, as both work together.
Coinsurance and Deductible: How They Work Together
Let’s understand with a full example:
- Deductible: ₹10,000
- Coinsurance: 20%
- Hospital bill: ₹1,00,000
Step 1: You pay ₹10,000 (deductible).
Remaining bill = ₹90,000
Step 2: You pay 20% of ₹90,000 = ₹18,000
Step 3: Insurance pays ₹72,000
Total you pay = ₹28,000
This shows why understanding both deductible and coinsurance is important before buying a policy.
Coinsurance vs Copay
Many people confuse coinsurance with copay.
| Feature | Copay | Coinsurance |
| Type | Fixed amount | Percentage |
| When paid | Every claim/service | After deductible |
| Predictability | High | Variable |
| Common use | Doctor visits | Major hospitalisation |
Copay offers predictable payments, while coinsurance depends on the total bill amount.
You should also understand copay in health insurance, as both impact out-of-pocket expenses differently.
How Coinsurance Affects Your Total Medical Cost
Coinsurance increases your out-of-pocket cost when:
- Hospital bills are large
- You require surgery
- Treatment costs are high
- You choose non-network hospitals
If your sum insured in health insurance is low and coinsurance percentage is high, your financial burden increases significantly.
Example:
Coinsurance = 30%
Hospital bill = ₹5 lakh
You may need to pay ₹1.5 lakh from your own pocket.
When Is Coinsurance Common in India?
Coinsurance is often seen in:
- Senior citizen health insurance plans
- Policies covering pre-existing diseases
- Super top-up policies
- Employer-provided group health insurance
Many senior citizen plans include mandatory 10–30% coinsurance to manage risk.
Always check policy wording carefully.
When Does Coinsurance Not Apply?
In some policies:
- Preventive health check-ups may be fully covered
- Certain treatments may have fixed coverage limits
- Some individual health insurance plans may not include coinsurance
If you are covered under employer insurance, review your group policy document carefully.
Health insurance policies in India are regulated by the Insurance Regulatory and Development Authority of India (IRDAI), and insurers must clearly disclose cost-sharing clauses.
Why Do Insurance Companies Use Coinsurance?
Insurance companies use coinsurance to:
- Share risk with policyholders
- Reduce unnecessary hospital claims
- Control premium pricing
- Encourage cost-conscious healthcare decisions
Policies with higher coinsurance typically have lower premiums.
Policies with lower coinsurance often have higher premiums.
What Happens If You Change Jobs?
If you resign from your job and are covered under employer insurance:
- Coinsurance rules may change
- Coverage conditions may differ
- You may lose certain benefits
It’s important to understand what happens to health insurance when you resign to avoid unexpected costs.
How to Choose the Right Coinsurance Percentage
Before buying a policy, consider:
- Your medical history
- Family size
- Age
- Risk tolerance
- Financial capacity
Lower coinsurance percentage means:
- Higher premium
- Lower out-of-pocket cost
Higher coinsurance percentage means:
- Lower premium
- Higher financial risk
Choose based on your comfort level and savings.
Frequently Asked Questions
What is coinsurance in simple words?
Coinsurance is the percentage of a medical bill that you pay after meeting your deductible.
Does coinsurance apply to every claim?
Usually, coinsurance applies after deductible is met and mainly on major hospital expenses.
Is coinsurance better than copay?
They serve different purposes. Copay is predictable, while coinsurance varies depending on the total bill.
How is coinsurance different from deductible?
Deductible is the fixed amount you pay before insurance starts. Coinsurance is the percentage you pay after the deductible.
Final Takeaway
Coinsurance in health insurance means sharing a percentage of medical expenses with your insurer.
It:
- Applies after deductible
- Impacts large hospital bills
- Reduces premium cost
- Increases out-of-pocket risk
Understanding coinsurance along with deductible, copay, waiting period, and sum insured helps you make informed decisions and avoid financial stress during major medical treatments.
About the Author
Shivakar Singh is the founder of Benefits Explained Simple, an educational platform focused on simplifying health insurance, workplace benefits, and financial decision-making. His work focuses on explaining complex benefit structures in clear, practical frameworks for working professionals.
“For a complete overview of how all these terms connect, read our India Health Insurance Guide.”