No-gap and known-gap private health cover: what they mean, what they don’t, and why choice can shrink
Why “no gap” is getting attention
With household budgets under pressure, many Australians are taking a harder look at whether private health insurance is delivering value. Premiums keep rising, specialist fees can be steep, and out-of-pocket costs can be difficult to predict. For people who use the private system, “bill shock” remains a persistent fear—especially when a single hospital admission involves multiple clinicians.
That is why “no gap” and “known gap” arrangements can sound appealing. They promise either zero out-of-pocket costs for certain medical services, or at least a clear, capped amount you will pay. These arrangements have also been in the news recently amid concerns about how an insurer has been negotiating with hospitals to provide this type of care. Beyond the headlines, the practical question for consumers is simpler: what do these terms actually mean, and what do they mean for your ability to choose your doctor?
The scale of out-of-pocket health spending
Australians spent A$44 billion out-of-pocket on health in 2023–24, which works out to $1,636 per person. But averages can be misleading. The bigger issue is how concentrated costs can be among people who use private hospital services. A single admission—particularly one involving surgery—can generate thousands of dollars in gap payments, and not all of them are expected.
Some of the most common sources of unexpected out-of-pocket costs during an admission include:
Anaesthetist fees that are well above the Medicare schedule fee (and because patients rarely choose their own anaesthetist, the bill can come as a surprise).
Surgical assistant fees that the insurer does not cover.
Consulting specialists seen during an admission who charge more than the Medicare rebate and do not participate in your insurer’s no-gap arrangement.
Underlying these issues is a basic structural feature of the system: specialist fees in Australia are unregulated, meaning doctors can charge what they like. In that environment, it is understandable that privately insured Australians look for cheaper or more predictable options.
How hospital billing works for private patients
To understand “no gap” and “known gap”, it helps to understand the baseline arrangements for private patients—whether they are treated in a private hospital or as a private patient in a public hospital.
Usually, Medicare pays 75% of the Medicare schedule fee for in-hospital medical services. Your private health insurer covers the remaining 25% of the schedule fee. If your doctor charges more than the combined Medicare and insurer payments, the difference is the “gap” you pay out-of-pocket.
In some cases, patients pay for their hospital admission first and then seek reimbursement from their private health insurer later. This can add another layer of uncertainty, particularly if it is not clear in advance which bills will be fully covered and which will generate a gap.
What “no gap” really means
In plain terms, a “no gap” arrangement means you pay nothing out-of-pocket for your doctor’s fees—but only if your doctor has agreed to participate in your insurer’s scheme.
Under these arrangements, the insurer pays participating doctors an agreed rate, and in exchange the doctor charges the patient nothing extra for that service. The benefit is straightforward: it reduces the risk of surprise bills for that part of your care. For planned procedures where you can choose a surgeon in advance, this can make a meaningful difference to both affordability and peace of mind.
However, the “no gap” label can be misunderstood as a blanket promise. In practice, it comes with limitations that matter for consumers.
The catch: your choice of doctor may be constrained
The biggest trade-off is choice. With “no gap”, you are generally limited to doctors who are in your insurer’s preferred network. If your preferred surgeon does not participate in the scheme, you may face out-of-pocket costs even if you have private cover.
Even if you carefully select a participating surgeon, other clinicians involved in your care may not be in the scheme. Anaesthetists are a common example: patients rarely choose their anaesthetist, and the person assigned on the day may not participate in your insurer’s no-gap arrangement. In that case, you can be “back to paying out-of-pocket” despite believing you had arranged no-gap care.
This is one reason “no gap” can reduce surprise bills without eliminating the possibility of them. It can improve predictability for some services, but it does not automatically control every cost associated with an admission.
No gap does not necessarily mean no extra costs for the admission
Another important limitation is scope. “No gap” arrangements apply to doctors’ fees. They do not necessarily cover other charges that may arise during a hospital stay. Depending on your plan, hospital room charges, theatre fees and prostheses may still generate gap fees.
For consumers, this distinction is crucial. A person can have “no gap” for the surgeon’s fee, but still face other out-of-pocket costs linked to the hospital component of care. Understanding what your policy covers—and what it does not—is as important as understanding whether a doctor is in a preferred network.
Outpatient specialist visits: where private insurance can’t help
There is also a major difference between in-hospital care and outpatient care. Outpatient consultations are the specialist appointments you have before or after a procedure, typically in the specialist’s private rooms.
Private insurers are legally prevented from covering these outpatient visits. For these consultations, Medicare pays 85% of the schedule fee. If the specialist charges above the schedule fee—which most do—the patient pays the full gap out-of-pocket, and private health insurance cannot cover it.
In practical terms, that gap can run to a few hundred dollars per visit. If you need ongoing specialist care, those costs can add up quickly. This is an area where “no gap” marketing around hospital services can create unrealistic expectations if people assume their private cover will also protect them from gaps outside hospital.
What “known gap” means—and why it can be more common
A “known gap” arrangement is often presented as a middle ground. Under known-gap schemes, the doctor charges above the schedule fee, but the insurer caps how much you pay—typically up to $500 per service—and you are told the amount before the procedure.
There are two practical advantages here. First, because doctors can still charge above the schedule fee, more doctors participate in known-gap schemes than in no-gap schemes. Second, that broader participation can translate into more choice for consumers, while still offering a clearer idea of what the out-of-pocket cost will be.
But known-gap arrangements have their own limits. When multiple specialists are involved—such as a surgeon, an anaesthetist and an assistant—those capped gaps can accumulate. Known-gap schemes can reduce surprise, but they do not eliminate cost.
Why insurers push these arrangements
Insurers have a clear financial interest in no-gap and known-gap schemes. By negotiating agreed rates with doctors, insurers can limit their liability and make their costs more predictable.
Large insurers with millions of members also have bargaining power. Doctors who want access to those patients may have an incentive to join the scheme, even if the agreed rates are below what they might otherwise charge.
For patients who see participating doctors, that shift can mean lower costs. At the same time, it increases insurers’ influence over which doctors patients can see without facing a financial penalty. In other words, the cost control can come with a subtle but real impact on consumer choice.
Networks and “managed care”: an international comparison, and Australia’s difference
In the United States, “managed care” has been the dominant model for decades. In that system, insurers build networks of preferred providers and financially penalise patients for going outside them.
Australia’s system is different. Medicare provides universal health-care coverage, and private health insurance sits alongside it. In Australia’s no-gap and known-gap schemes, you can still see any specialist doctor using your private health insurance, but you may pay more for doctors outside your insurer’s network.
This distinction matters because it shapes the trade-offs consumers face. The system does not prevent you from choosing a particular specialist, but it can make that choice more expensive.
What to check before you rely on “no gap” or “known gap”
Because these arrangements can be helpful but limited, it is worth approaching them as tools for reducing uncertainty rather than guarantees that all costs will disappear. Before a planned admission, consumers should focus on clarity: which services are covered under no-gap or known-gap rules, and which parts of the episode of care could still attract out-of-pocket charges.
Key points to confirm include:
Whether your surgeon participates in your insurer’s no-gap or known-gap scheme for the specific service.
Whether other clinicians involved (such as the anaesthetist, assistant, or consulting specialists during the admission) participate in the relevant scheme.
Whether your plan may still leave gaps for hospital charges such as room costs, theatre fees or prostheses.
How outpatient consultations will be billed, noting private insurance cannot cover these visits and Medicare pays 85% of the schedule fee.
These checks do not solve the underlying problem of high and unpredictable fees, but they can reduce the risk of unexpected bills and help people make informed choices about where and how they receive care.
A workaround, not a cure
No-gap and known-gap schemes are best understood as private-sector responses to a broader policy challenge: out-of-pocket health-care costs that can be high, unevenly distributed, and hard to predict. They can be useful for consumers, particularly in planned hospital care where costs can otherwise escalate quickly.
But they are not a complete solution. Specialist fees remain unregulated, and outpatient specialist visits can still generate substantial gaps that private insurance cannot cover. Even within hospital care, no-gap promises depend on whether each clinician involved in your treatment participates in the scheme, and other hospital-related charges may still apply depending on your policy.
A more fundamental approach would be for government to set a fair Medicare schedule fee, updated annually, and tie rebates to specialists who charge at or near that fee. Under this approach, specialists who charge well above the schedule fee would not receive the same taxpayer subsidy (the Medicare rebate) as those who charge more reasonably. That would target the root cause rather than relying on insurer networks to contain costs.
Until then, no-gap and known-gap arrangements may help some patients reduce or better predict their expenses. The trade-off is that the most “affordable” pathway may come with fewer options—or higher costs if you step outside a preferred network.