What is Supplementary Major Medical (SMM)? Learn more about the key benefits!

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What is Supplementary Major Medical (SMM)? Learn more about the key benefits!

Explore SMM supplementary medical coverage in Hong Kong's Voluntary Health Insurance Scheme (VHIS). Learn how it provides extra protection for major medical expenses beyond standard plans.

“Supplementary Major Medical” (SMM) refers to compensating the remaining medical expenses when medical expenditures exceed the compensation limit of eligible coverage items.

Medical insurance plans with SMM available in the market generally compensate 80% of the medical expenses exceeding the coverage limit, with annual compensation caps ranging from $100,000 to $220,000. The covered compensation items vary depending on the policy. It’s worth noting that SMM also includes coinsurance , typically at 20%, meaning the insured must pay 20% of the excess amount.

Why You Need Supplementary Major Medical?

Medical inflation causes medical expenses to rise continuously, potentially exceeding compensation limits. This is when “Supplementary Major Medical” comes into play, compensating for medical expenses beyond the compensation limit , greatly reducing the financial pressure on the policyholder.

For a simple example, suppose Mr. Chan unfortunately falls ill and needs to be hospitalized for multiple examinations, with total miscellaneous hospitalization expenses of $30,000. However, in his medical insurance, the coverage limit for ” miscellaneous expenses ” is $18,000, leaving $12,000 uncompensated. If his medical insurance includes SMM with a limit of $100,000 and 20% coinsurance, he can receive a total compensation of $27,600, and Mr. Chan only needs to pay $2,400 out-of-pocket.

SMM Compensation Example
Actual Medical Expenses $30,000
Miscellaneous Expenses ” Compensation Amount $18,000
Remaining Uncompensated Amount $30,000 – $18,000 = $12,000
SMM Compensation Amount $12,000 x 80% = $9,600
Total Compensation Amount $18,000 + $9,600 =

$27,600

Coinsurance (Deductible) $12,000 x 20%= $ 2,400

 

What Does Supplementary Medical Coverage Include?

Taking Bowtie VHIS Flexi Plan (Regular / Plus) as an example, the “Supplementary Medical Coverage” (SMM) reimburses 80% of the medical expenses exceeding the compensation limit for the relevant items (adjusted according to the ward level). The coverage items and annual compensation limits are as follows:

Bowtie VHIS
Flexi Plan

(Regular)

Flexi Plan

(Plus)

Annual Compensation Limit $120,000 $220,000
Coverage Items

 

  • *The compensation limit for intensive care is restricted by the number of days, not the daily compensation limit.
  • 1The company has the right to request proof of the relevant written recommendation, such as a referral letter or a statement provided by the attending physician or registered doctor in the claim application form.

How Much Can SMM Save You?

Case Study 1

Taking Colorectal Cancer surgery – “Laparoscopic Colectomy” as an example, the total charge (median) at St. Teresa’s Hospital in 2021 was $172,859, including $102,000 in “doctor fees” and $70,859 in “hospital fees”, with the patient requiring 7.5 days of hospitalization.

If the medical insurance plan includes SMM, the expected reimbursement rate can increase from 74.9% to 93.6% .

St. Teresa’s Hospital Bowtie VHIS Flexi Regular – Reimbursement Amount
Surgeon’s Fee $102,000 $60,000(*1)+

$21,000(*1)+

$960 x 7.5= $88,200#

Anesthetist’s Fee
Ward Round Fee
Ward Room Charge# $750 x 7.5=$5,625 Full Reimbursement ($5,625)
Operating Room Fee $10,870 Full Reimbursement ($10,870)
Abdominal MRI Diagnostic Scan (with Contrast) $9,900 $6,930(*2)
Miscellaneous Expenses (*3) $44,464 $18,000
Supplementary Medical Coverage (SMM) ($26,464 +$13,800) * x 80% = $32,211.2
Total Surgery Cost $172,859
Estimated Reimbursement / Out-of-Pocket (Without SMM) $129,625 / $43,234
Estimated Reimbursement / Out-of-Pocket (With SMM) $161,836.2 / $11,022.6
Reimbursement Rate 74.9% -> 93.6%

 

  • #Admitted for 7.5 days in a standard room for 3 to 4 people.
  • 1Assume full utilization of the voluntary health insurance "surgeon's fee" and "anesthetist's fee" coverage limits.
  • 2With 30% co-insurance, reimbursing up to 70% of the expenses.
  • 3Assume miscellaneous fees = hospital fees - room charges - operating room fees - MRI diagnostic scan charges.
  • * $26,464 (=$44,464 - $18,000) is the miscellaneous fees exceeding the reimbursement limit, $13,800 (= $102,000 - $88,200) is the surgeon's fee and anesthetist's fee exceeding the reimbursement limit.

Case Two (Provided by Senior Financial Planner Per Lam )

One Sunday morning, the phone kept ringing. Upon answering, I immediately heard Lydia’s unusually anxious voice. It turned out that the night before, her father suddenly experienced severe chest pain and difficulty breathing. Although the situation improved slightly by morning, Lydia was still very worried and planned to accompany her father to the hospital for a check-up, but she didn’t know whether to go to a public hospital or a private hospital .

Since Lydia’s father had medical insurance and was worried the condition might suddenly worsen, I immediately helped Lydia contact a cardiologist , and arranged for a detailed examination at a private hospital that same day.

The doctor performed various tests on Lydia’s father, including a stress electrocardiogram and CT scan . It was confirmed that one of his coronary arteries was severely blocked, requiring percutaneous coronary intervention, commonly known as balloon angio . The doctor performed the surgery on Lydia’s father the next day. Fortunately, it was detected early and the surgery was done promptly. After resting for a few days post-surgery, he was able to be discharged. The hospitalization lasted four days, with surgery fees and other miscellaneous expenses totaling about $150,000.

About a week after submitting the documents, the insurance company completed the approval, and Lydia received approximately $120,000 in compensation from the insurance company. Many readers, like Lydia, might wonder why it wasn’t full compensation of $150,000. How was the $120,000 compensation amount calculated?

Continuing with Lydia’s case as an example, the table below lists the hospital and doctor’s charges as well as the insurance company’s detailed reimbursements. It can be seen that the doctor’s ward round fees, hospital miscellaneous fees , surgical fees , and operating room expenses all exceeded the basic coverage limits . Hospital miscellaneous fees usually include various tests such as blood tests , cardiac ultrasound , stress electrocardiogram , and CT scan , which often easily exceed the basic coverage limits. Fortunately, this medical insurance includes SMM , where the insurance company covers 80% of the excess amount.

Coverage Scope Actual Expenditure Reimbursement Amount Difference
Basic Coverage
Room and Board $3,798 $3,798 $0
Doctor’s Ward Round Fees $8,000 $3,432 $4,568
Hospital Miscellaneous Fees $20,694 $9,750 $10,944
Surgical Fees $70,000 $29,250 $40,750
Operating Room Expenses $41,835 $11,700 $30,135
Post-Surgery Outpatient Care $4,050 $975 $3,075
Total $148,377 [a]$58,905 $84,904
Supplementary Medical Coverage (Reimbursing 80% of the amount exceeding basic coverage)
Supplementary Medical Coverage (SMM)

( = $84,904 x 80% )

[b] $67,923
Total Reimbursement Amount (= [a] + [b]) $126,828

Astute readers may notice that the operating room expenses in this case are higher than usual, and the supplementary medical coverage does not include the difference in doctor’s ward round fees. This is because the cardiac stent costs were allocated to operating room expenses, and SMM only covers doctor’s ward round fees starting from day 181 of hospitalization. Different insurance companies may handle this differently.

In summary, a comprehensive medical insurance policy is very important, and supplementary medical coverage is essential. When needed, you can choose to seek treatment at a private hospital . In this case, without supplementary medical coverage, the medical expenses to be borne would not be $20,000 but nearly $90,000. If you feel that the basic medical insurance coverage amount may not be sufficient, consider upgrading to a higher level of coverage plan.

In simple terms, Supplementary Medical Coverage (SMM) can make your protection more comprehensive!

Need a medical insurance with SMM? Bowtie VHIS Flexi Plan might help you! Apply 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 Bowtie Team 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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