To check whether you are eligible for a health insurance refund, you can use the refund inquiry and application service provided by the National Health Insurance Service. However, since "refund" is a comprehensive term that encompasses insurance premium overpayments, copayment refunds, and out-of-pocket maximum excess amounts, it is important to understand the different types and the reasons they occur.

What Is the Out-of-Pocket Maximum Excess Amount?

The out-of-pocket maximum excess amount system is designed to alleviate excessive medical cost burdens. If the total amount of health insurance-covered copayments paid by a subscriber between January 1 and December 31 of a given year exceeds the individual cap determined by income level and other factors, the National Health Insurance Service covers the excess amount.

Items Excluded from the Maximum Amount Calculation

• Non-covered services and selective benefits
• Full copayments
• Implant costs
• Semi-private room (2- and 3-bed room) hospitalization fees
• Chuna manual therapy copayments
• Outpatient care for mild conditions at tertiary hospitals (initial and follow-up visits)

How to Check and Apply for Refunds

Refunds can be checked through the refund inquiry and application menu on the National Health Insurance Service website and the "The Health Insurance" mobile application.

Payment Account Requirements

• In principle, applications must be made using an account under the name of the person who received treatment
• To receive payment in an account other than your own, online application is not available; a separate application must be submitted to a regional branch office

Documents Required When Applying with an Account Under the Name of a Direct Ascendant or Descendant

• Detailed family relations certificate based on the person who received treatment
• Power of attorney
• Identification documents and other related materials requested by the Service

If the individual has difficulty applying directly or granting power of attorney due to conditions such as dementia, a medical certificate or doctor's opinion may be additionally required. When delegating authority to other family members or third parties, a power of attorney, identification, and other related documents must also be submitted to the branch office. Since the required documents vary depending on the relationship between the applicant and the person who received treatment, as well as whether the individual's own intent can be verified, it is necessary to confirm with the Service before submitting.

Points to Check Even After Receiving a Refund

Possibility of Post-Payment Recovery

Even if a refund has been paid, it cannot be considered final. If the out-of-pocket maximum or total copayment amount changes due to health insurance premium recalculation, changes in subscription eligibility, medical institution billing errors or duplicate claims, medical benefit re-examination, or benefit restriction reasons, all or part of the amount already paid may be recovered.

Year-End Tax Settlement Medical Expense Deduction

Details of out-of-pocket maximum excess amount payments may be reported to the National Tax Service in accordance with relevant laws and regulations. If medical expenses related to the refunded amount were deducted during the year-end tax settlement, you may receive guidance to verify whether an excessive deduction was claimed or to file an amended return.

Therefore, when checking for refunds, you should verify not only your eligibility for payment but also the type of refund, account requirements, proxy application documents, the possibility of post-payment recovery, and whether the refund affects your year-end tax settlement. Actual refund eligibility, payment amounts, and required documents vary depending on individual treatment and premium records, as well as the results of the Service's review.

[This article was written with AI assistance. This article provides general information to explain the National Health Insurance Service's out-of-pocket maximum system and refund application procedures. Individual eligibility for payment and required documents must be confirmed through the National Health Insurance Service website or customer service center.]