Checking whether you have medical costs that can be recovered through a National Health Insurance refund inquiry has become more important than ever. It has been confirmed that approximately 50.6 billion won of out-of-pocket ceiling excess payments, which had been decided to be paid to health insurance subscribers, went unpaid due to the expiration of the statute of limitations. The number of people who were eligible for refunds but did not actually receive the money approaches 64,000.

According to data received from the National Health Insurance Service by Representative Sohn Byung-hoon of the Democratic Party of Korea, a member of the National Assembly Health and Welfare Committee, on the 23rd of last month, of the out-of-pocket ceiling excess payments decided for disbursement between 2020 and 2022, the amount that went unpaid due to the statute of limitations expiring totaled 50.597 billion won as of the 9th of this month. The number of affected individuals was counted at 63,994. Dividing the unpaid amount by the number of eligible recipients comes to an average of about 790,000 won per person.

This means that there were not a few cases where the benefits of the refund system, created to reduce medical cost burdens, did not translate into actual payments. As this fact came to light, attention has also focused on how to check for National Health Insurance refunds and the procedure for confirming eligibility for out-of-pocket ceiling excess payments.

■ What Are National Health Insurance Refunds and Out-of-Pocket Ceiling Excess Payments?

National Health Insurance refunds collectively refer to amounts that must be returned to subscribers in connection with health insurance. Representative examples include premium refunds arising from duplicate payments or erroneous billing of insurance premiums, and out-of-pocket ceiling excess payments that occur when annual medical cost burdens exceed an individual's ceiling amount. The 50.597 billion won left unpaid this time due to the expiration of the statute of limitations corresponds to out-of-pocket ceiling excess payments among various refunds, and it should not be interpreted as the same figure as the total unpaid scale of all National Health Insurance refunds.

The out-of-pocket ceiling system is a scheme in which, if the legally mandated copayment among health insurance-covered medical costs paid by a subscriber over a year exceeds the individual ceiling amount, the difference is returned. It is operated to alleviate the economic burden on households caused by excessive medical expenditures.

However, not all expenses paid at hospitals or pharmacies are included in the calculation. Some items, such as non-covered treatment costs and selective benefits, are excluded from the ceiling calculation. Individual ceiling amounts are also applied differently depending on income level and other factors. As of 2025, individual out-of-pocket ceilings range from 890,000 won to 10.74 million won. Therefore, even if the same amount was spent at medical institutions, the refundable amount may differ depending on the applicable criteria and medical cost items for each subscriber.

■ How to Check National Health Insurance Refunds: Website, App, and Customer Center

National Health Insurance refunds can be checked on the official website of the National Health Insurance Service. After accessing the website, you can use the 'Refund Inquiry/Application' menu to see whether there are refunds payable to you. The service can be used after undergoing login and verification procedures for identity confirmation.

Related services are also available through 'The Health Insurance' mobile app of the National Health Insurance Service. If online use is difficult or eligibility needs to be confirmed in detail, guidance can be obtained through the NHIS customer center at 1577-1000.

■ What to Check Along With the Inquiry: Application Eligibility and Statute of Limitations

When checking National Health Insurance refunds, it is necessary to confirm not only eligibility but also whether an application can be made and the statute of limitations. This is because the fact that a refund has arisen and whether it can actually be received must be distinguished.

The 50.597 billion won confirmed this time is not simply a payment pending, but an amount that could not be paid because the statute of limitations has expired. Therefore, it does not mean that the entire amount is money that can currently be refunded simply through inquiry or application. In addition, it has not been confirmed that all of the 63,994 people who did not receive refunds were prevented for the same specific reasons. Whether they failed to receive payment notices, failed to complete the application procedure, or had other reasons can only be determined with separate data.

The reason National Health Insurance refund inquiries are important is that they are a means for eligible recipients to directly check their payment records. In particular, out-of-pocket ceiling excess payments are calculated based on annual medical costs and individual ceiling amounts, so one cannot simply conclude that someone is eligible for a refund merely because they spent a lot on hospital bills.

This unpaid situation shows that attention needs to be paid to the process from the payment decision under the out-of-pocket ceiling system through to the actual refund. As the system was created to ease medical cost burdens, whether amounts decided for payment are delivered to recipients before the statute of limitations expires remains an important issue.

Subscribers who wish to check National Health Insurance refunds can review their refund records on the NHIS official website or mobile app, and if there are payable amounts, apply according to the guided procedure. However, if the inquiry shows no refund or if the statute of limitations on past payment decisions has already expired, separate confirmation is needed.

[This article was written for the purpose of providing information on National Health Insurance-related systems and refunds. Refund eligibility, payable amounts, and the statute of limitations may vary depending on individual circumstances, so they must be confirmed through the official NHIS website or customer center. AI provided partial assistance.]