National Health Insurance Refunds: What Can You Get Back?

The National Health Insurance Corporation (NHIC) operates a settlement system that refunds subscribers for overpaid insurance premiums or out-of-pocket medical expenses that exceed income-based thresholds. There are two main reasons refunds occur.

1. Overpaid Insurance Premiums

When a subscriber's eligibility changes or property-related data is not reflected immediately, they may pay more in premiums than the actual assessed amount. Overbilling can typically occur during the transition from a regional subscriber to an employee-based subscriber.

2. Excess Amount Under the Co-Payment Cap System

The NHIC sets an annual out-of-pocket medical expense limit based on the subscriber's economic level. If the annual co-payment for covered treatment services, excluding non-covered items and some hospitalization fees, exceeds this threshold, the excess amount can be refunded.

2024 Co-Payment Cap Criteria

Limits are applied differentially based on annual average insurance premium brackets, ranging from 870,000 won for the lowest 1st percentile to 8.08 million won for the highest 10th percentile.

For hospitalizations exceeding 120 days in long-term care hospitals, separate criteria are applied and the limit is raised. It ranges from 1.38 million won for the 1st percentile to 10.50 million won for the 10th percentile.

Example | If a subscriber in the 6th–7th income percentile spent 4 million won on standard medical expenses annually, they would receive a refund of 870,000 won, after deducting the 3.13 million won cap for that bracket.

Important Notes on Application Timing and Statute of Limitations

The NHIC sends notification letters to eligible recipients in late August each year, once the cap amount is finalized. The right to claim a refund must be exercised within 3 years of receiving the notice; after this period expires, the statute of limitations runs out and the right is extinguished.

How to Check Refund Eligibility

Regardless of whether you received a notification letter, you can directly check your eligibility through the following channels:

• The official National Health Insurance website
• The mobile app 'The Health Insurance' refund inquiry menu

Subscribers who changed jobs frequently or had high medical expenses should especially check their eligibility.

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*※ The refund amount and eligibility may vary depending on individual income brackets and medical treatment history. Please verify the exact refund amount and detailed application information directly through the official NHIC website or customer service center. This article was written with AI assistance.*