‘No gap’ and ‘known gap’ health cover: what they mean, what they don’t, and why choice can shrink
Why “gap” costs are back in focus
As household budgets tighten, many Australians are taking a harder look at whether private health insurance is delivering value. Premiums continue to rise, specialist fees can be high, and “bill shock” remains a familiar fear—particularly for people who use the private system and discover that not every part of their care is covered in the way they expected.
That is why “no gap” and “known gap” arrangements sound appealing. They promise either zero out-of-pocket payments for certain medical services, or at least a clear, capped amount that patients can be told about ahead of time. These arrangements have also attracted attention because of concerns about how insurers negotiate with hospitals to provide this type of care.
But the headline terms can be misleading if they are taken to mean “no extra costs at all” or “full freedom to choose any specialist without financial consequences”. In practice, “no gap” and “known gap” are specific billing arrangements that can reduce uncertainty for some parts of hospital care, while leaving other costs untouched and sometimes narrowing the practical range of specialists a patient can use without paying more.
The scale of out-of-pocket health spending
Australians spent A$44 billion out-of-pocket on health in 2023–24—about $1,636 per person. That average, however, can hide what the problem looks like for people who rely on private hospital care. Costs are often concentrated among those who have admissions involving multiple doctors and services, where gap payments can quickly climb into the thousands of dollars.
In private hospital admissions, patients may encounter several separate bills. Some of these are predictable, but others can arrive unexpectedly—especially when patients have limited control over which clinicians are involved in their care or how much those clinicians charge.
Where surprise bills can come from during an admission
Even with private health insurance, out-of-pocket costs can appear for a range of reasons. Common examples include situations where a clinician charges above the Medicare schedule fee, or where a particular fee is not covered by the insurer’s arrangements.
Anaesthetist fees above the Medicare schedule: Patients rarely choose their own anaesthetist, so this bill can be an unwelcome surprise if the anaesthetist charges well above the scheduled amount.
Surgical assistant fees: In some cases, the insurer may not cover the assistant’s fees, leaving the patient to pay.
Consulting specialists during an admission: Patients may see additional specialists while in hospital. If these doctors charge more than the Medicare rebate and do not participate in the insurer’s “no gap” arrangement, the patient can face extra charges.
Underlying these experiences is a structural issue: specialist fees in Australia are unregulated, meaning doctors can set their own prices. This creates wide variation in what patients may be asked to pay, and it helps explain why many privately insured Australians seek cheaper or more predictable billing options.
How private hospital billing works in broad terms
Understanding “no gap” and “known gap” starts with the typical payment pathway for private patients—whether they are treated in a private hospital or as a private patient in a public hospital.
For doctors’ fees in hospital, Medicare usually pays 75% of the Medicare schedule fee. The private health insurer then covers the remaining 25%. If the doctor charges more than the combined Medicare and insurer payment, the patient pays the difference. In some situations, patients may pay for their hospital admission first and then seek reimbursement from their insurer later.
This is the “gap”: the amount above what Medicare and the insurer will pay under the schedule-based split. “No gap” and “known gap” are approaches designed to reduce that gap, or at least make it more predictable.
What “no gap” actually means
In a “no gap” arrangement, the patient pays nothing out-of-pocket for the participating doctor’s fees for that service. The key word is “participating”. The arrangement works because the insurer and the doctor have agreed to a set rate, and in exchange the doctor agrees not to charge the patient anything extra for that service.
For consumers, the practical benefit is straightforward: it can remove surprise bills for that particular medical service. For a planned procedure—where a patient can choose a surgeon in advance—this can be especially valuable, because the patient can try to line up care with a doctor who participates in the insurer’s scheme.
However, “no gap” comes with a significant limitation: it generally applies only if the doctor is part of the insurer’s preferred network. If a preferred surgeon is not in the scheme, the patient may face out-of-pocket costs. And even if the surgeon participates, other clinicians involved on the day—such as the anaesthetist—may not, which can bring the gap back into the bill.
What “no gap” does not cover
It is also important to separate doctors’ fees from other parts of a hospital episode. “No gap” arrangements relate to doctors’ fees, not necessarily the full cost of being admitted.
Hospital room charges, theatre fees and prostheses may still generate gap fees depending on the patient’s plan. In other words, a patient can have “no gap” on the medical side and still face costs elsewhere in the admission.
The outpatient trap: consultations before and after hospital
One of the most misunderstood boundaries in private health insurance is the distinction between inpatient hospital services and outpatient specialist consultations in private rooms.
Private insurers are legally prevented from covering outpatient specialist visits. For these consultations, Medicare pays 85% of the schedule fee. If the specialist charges above the schedule fee—which many do—the patient pays the entire gap out-of-pocket, with no insurance contribution at all.
These consultation gaps can be a few hundred dollars per visit and can accumulate quickly for people who need ongoing specialist care. This means that even consumers who carefully organise “no gap” arrangements for a hospital procedure may still face significant costs in the lead-up to treatment and in follow-up care afterward.
What “known gap” means—and why it can increase choice
“Known gap” is often presented as a middle ground. Under a known-gap arrangement, the doctor charges above the schedule fee, but the insurer caps how much the patient will pay—typically up to $500 per service—and the patient is told the amount before the procedure.
Because doctors can still charge above the schedule fee, more doctors may be willing to participate in known-gap schemes than in no-gap schemes. For consumers, that can translate into more choice of specialist than a strict no-gap network, while still offering more certainty than open-ended billing.
Yet the trade-off is clear: the gap is reduced and disclosed, but it is not eliminated.
When multiple specialists are involved, caps can still add up
Hospital care is rarely delivered by a single clinician. A procedure may involve a surgeon, an anaesthetist and an assistant, alongside other consulting specialists during the admission. Even when each bill is capped under a known-gap arrangement, the total out-of-pocket cost can rise as each service attracts its own gap payment.
Known-gap arrangements can therefore be best understood as a way to reduce surprise and provide upfront clarity, rather than a guarantee of low overall costs.
Why insurers like these arrangements
There is also a commercial logic behind 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 have bargaining power. Doctors who want access to those patients may have an incentive to join the insurer’s scheme, even if the agreed rate is lower than what they might otherwise charge. For patients whose doctors participate, this can mean lower out-of-pocket costs.
At the same time, as these arrangements expand, insurers can gain more influence over which doctors patients can see without a financial penalty. The result is not necessarily a formal restriction on choice, but a pricing structure that can push consumers toward in-network clinicians if they want to avoid extra costs.
How this differs from “managed care” elsewhere
In the United States, “managed care” has been a dominant model for decades. In that model, insurers build networks of preferred providers and financially penalise patients for going outside those networks.
Australia’s system is different because Medicare provides universal health-care coverage, and private health insurance operates alongside it. Under Australia’s no-gap and known-gap schemes, patients can still see any specialist doctor using private health insurance, but they may pay more if they choose doctors outside their insurer’s network.
That distinction matters: the Australian approach is not identical to US-style managed care, but it can still shape consumer behaviour by attaching different price tags to different choices.
What to take away: predictability versus freedom
For consumers, the practical question is often not whether no-gap or known-gap is “good” or “bad”, but what is being traded off.
No gap can offer the strongest protection against out-of-pocket costs for a participating doctor’s fees, but may limit you to a preferred network and can break down if other clinicians involved in your care are not participating.
Known gap can provide upfront clarity and a cap on what you pay, and may include more doctors than no-gap schemes, but the costs can still be significant—especially when several specialists bill separately.
Neither option automatically covers everything: hospital charges and prostheses may still involve gaps depending on your plan, and outpatient consultations in private rooms are not covered by private insurers.
Why this is ultimately a policy problem, not just a product feature
No-gap and known-gap schemes are best seen as private-sector responses to a deeper issue: high and unpredictable out-of-pocket costs driven in part by unregulated specialist fees and the way schedule fees and rebates operate.
A policy approach proposed in the debate is for government to set a fair Medicare schedule fee, update it annually, and tie rebates to specialists who charge at or near that fee. Under that approach, specialists who charge well above the schedule fee would not receive the same taxpayer subsidy (Medicare rebate) as those who charge more reasonably.
This kind of change is aimed at the root cause of large gaps. By contrast, no-gap and known-gap arrangements can be useful tools for reducing out-of-pocket costs and limiting surprises, but they function more like workarounds than a complete solution to the affordability problem.
Bottom line
“No gap” and “known gap” can make private hospital care more predictable and, in some cases, cheaper for patients—particularly when treatment is planned and the relevant clinicians participate in the insurer’s scheme. The catch is that these arrangements can influence which doctors are financially practical to see, and they do not eliminate other sources of out-of-pocket spending, especially outpatient consultations that insurers cannot cover.
For Australians weighing up private health insurance during a cost-of-living squeeze, the most important step is understanding what the “gap” label applies to, where it stops, and how quickly costs can accumulate when multiple clinicians and services are involved.