What is unknown pre-existing conditions? Can VHIS cover them?

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What is unknown pre-existing conditions? Can VHIS cover them?

Explore what unknown pre-existing conditions mean in Voluntary Health Insurance Scheme (VHIS) and how they impact your coverage.

What are Unknown Pre-existing Conditions?

“Unknown pre-existing conditions” refer to diseases that the insured was unaware of before applying for insurance, or that had no obvious signs or symptoms, or for which no medical consultation or treatment had been sought.

Pre-existing vs Unknown Pre-existing Conditions

The following is a frequently asked question:

If you have never had a medical check-up and are completely unaware of any abnormal health conditions or diseases that need to be declared (for example, never had a sleep test), and you answer that you do not have sleep apnea when applying for insurance. If you later discover you have sleep apnea, will it affect your claim?

Does VHIS Cover Unknown Pre-existing Conditions?

Traditional medical insurance generally includes an exclusion clause that refuses to cover “unknown/known pre-existing conditions” before the policy takes effect; whereas Voluntary Health Insurance Scheme (VHIS) conditionally provides coverage for “unknown pre-existing conditions” at the time of application.

In view of this, when the government launched the Voluntary Health Insurance Scheme , it required that the coverage must include unknown pre-existing conditions to provide customers with more comprehensive protection and reduce disputes in insurance claims.

According to the guidelines of the Voluntary Health Insurance Scheme , if the policyholder claims for unknown pre-existing conditions during the waiting period, the insurance company will compensate according to the situation. The waiting period is 3 policy years, with compensation rates of 0%, 25%, and 50% for the first 3 policy years, respectively.

Compensation Rate for Unknown Pre-existing Conditions
First Policy Year No coverage
Second Policy Year 25% of the benefit limit
Third Policy Year 50% of the benefit limit
Fourth Policy Year 100% of the benefit limit

VHIS Standard Plan products on the market will provide compensation at no less than this level, and some Flexi Plan products have even more lenient waiting period conditions for unknown pre-existing conditions. Bowtie has reduced the waiting period for unknown pre-existing conditions to:

Waiting Period (from the policy effective date) Compensation Ratio^
First 90 Days 0%
Day 91 and Thereafter 100% of the benefit limit
  • ^Applicable to Bowtie VHIS Flexi Plan and Bowtie Pink VHIS Plan .

Of course, some insurance companies in the market already provide full compensation for unknown pre-existing conditions in the first policy year. However, to reduce the possibility of abuse of this clause, Bowtie has set the waiting period for unknown pre-existing conditions to the first 90 days of the first policy year.

Claims Handling for Post-Policy Diagnoses

Unknown Pre-existing Conditions at Time of Insurance VHIS Standard Plan Traditional Medical Insurance
Diagnosed within 3 months after the policy’s effective date No compensation will be made, as the compensation rate is 0% during the waiting period in the first policy year Generally no compensation
Diagnosed in the 3rd year after the policy’s effective date Partial compensation will be made according to the 50% compensation rate in the 3rd policy year (during the waiting period) Generally no compensation

How Insurers Determine Unknown Pre-existing Conditions?

When customers apply for medical insurance, the insurance company requires them to fill out a questionnaire about their health status for underwriting purposes. The policyholder must truthfully disclose all known past medical history and current health conditions. The insurance company will make an underwriting decision based on the applicant’s health and medical history declaration.

When the insured later submits a claim, the insurance company needs to determine whether the insured’s physical condition or illness existed before the policy effective date (Pre-existing conditions) or is an “unknown pre-existing condition at the time of application.” The insurance company will judge whether the insured’s diagnosis falls under “unknown pre-existing condition at the time of application” based on the previously declared information and the most recent medical reports (doctor’s diagnosis results).

For example, certain conditions can be determined as pre-existing regardless of when they are discovered. The most obvious example is congenital diseases, which must have existed before the insurance application, such as congenital heart disease (including ventricular and atrial septal defects, commonly known as heart leakage ).

What Are the Consequences of Not Disclosing Pre-Existing Conditions?

As mentioned earlier, policyholders should disclose their health conditions and medical history truthfully to the best of their knowledge. Intentionally concealing information violates the “utmost good faith principle,” which may result in the policy adding exclusions , Premium Loading , becoming invalid , or leading to claim rejections in the future.

If the insurance company has doubts about a claim application, it has the right to request the insured’s medical records from public hospitals or private medical institutions. Therefore, the insurance company will not be unaware of the existence of “pre-existing conditions.”

What is the “Utmost Good Faith Principle”?

According to common law, commercial contracts must be entered into with good faith. Good faith is divided into general good faith and utmost good faith. General good faith means that all parties to the contract must provide true and non-fictitious information honestly. However, they have no duty to ensure that the other party obtains all “material” information.

Simply put, you must answer truthfully to the questions asked by the other party, but if they don’t ask, you don’t necessarily have to disclose all information, regardless of its importance.

However, insurance contracts are bound by the stricter utmost good faith principle. What does this mean? It means that you must disclose all material facts to the other party, regardless of whether they have asked about them.

What are material facts? They are any circumstances that could influence a prudent insurance company in setting premiums or deciding whether to accept the risk.

Interested in VHIS? Check Premiums and Enjoy Offers Now!

⚡Bowtie VHIS Learning Centre Promo!

Tired of sky-high private hospital bills but hesitant about purchasing VHIS? Bowtie Pink provides full coverage*, with long-term premiums are substantially lower than market rates^.

For a limited time, use the exclusive Bowtie Learning Centre promo code 【BLOGENGLEARNING】to get 50% off in first year’s premium and secure top-tier health protection at an unbeatable price!

At the same time, for just HK$200 per month, policyholders can add on the GHK Wellness Package / CUHKMC Wellness Package, providing comprehensive coverage for your medical needs!



*Full coverage shall mean no itemized benefit sub-limits, and applies to designated benefit items only. The benefit payable shall be subject to the remaining deductible (if applicable), annual benefit limit, lifetime benefit limit and other limitations such as reasonable and customary charges, a pre-existing condition, “List of Designated Hospitals in Mainland China” and receiving medical treatment in the United States. For detailed terms and conditions, product risks, and exclusions, please refer to the relevant product website and policy.
^Based on a market survey conducted by Bowtie on December 29, 2025, comparing similar types of VHIS (full reimbursement, general ward class, deductible level, and coverage area) available for online purchase, Bowtie Pink VHIS (Ward) offers lower monthly premiums for non-smokers aged 0-14 and 23-98. Different medical insurance plans have varying coverage scopes and benefit limits; please refer to the relevant policy documents, terms and conditions for details.

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The content of this article is provided by 《智偉保險理財Talk》劉智偉 and serves for reference only. It does not represent Bowtie's position. Bowtie assumes no responsibility for any loss or damage incurred by any person as a result of using, misusing, or relying on any information or content herein. Any content related to Bowtie products in this article is for reference and educational purposes only. Customers should refer to the detailed terms and conditions on the relevant product web pages.
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