How to fill empty appointment slots in a therapy practice

In short

• Empty slots come from one of three places: not enough demand, demand that leaks before it books, or bookings that cancel. Fix the one you have, not all three.
• Most practices sit between 65% and 80% utilisation. Every five points on a four-clinician practice is about $50,000 a year.
• The fastest fills are already in your software: the waitlist, the recall list, and patients with Medicare sessions left this calendar year.

Why is the diary empty on Thursdays and full on Mondays?

Because an empty slot has three possible causes, and each one needs a different fix.

No demand. Not enough people are looking for what you do, in your area, at the times you offer. This is a marketing problem. It shows up as a diary that is thin every week, not just some weeks, and a front desk that is quiet.

Demand that leaks. People enquire and do not book. The phone rings out at 12:40, the website form goes to an inbox nobody checks until Tuesday, the online booking widget only shows next week. This is an intake problem. It shows up as a busy front desk and a diary that still has holes.

Bookings that cancel. The diary was full on Friday afternoon and had four gaps by Monday lunchtime. This is a cancellation and rebooking problem. It shows up as a high cancellation rate, patients who stop after two visits, and clinicians who finish early on days that looked full.

Owners tend to reach for the first fix (more marketing) when the diary has the second or third problem. Buying Google Ads into a phone that rings out fills nothing. Before you spend, work out which of the three you have. The rest of this guide takes them in reverse order, because the third and second are cheaper and faster to fix than the first.

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What is your utilisation rate and what should it be?

Utilisation is billed hours divided by available hours. Most practices sit between 65% and 80%. Above 85% you start turning people away.

Utilisation rate is the share of a clinician’s available appointment hours that were billed. A clinician rostered for 30 clinical hours who bills 21 of them ran at 70%. (Cliniko, April 2021)

Published Australian targets cluster in the same place. Scale Suite’s physiotherapy finance guide puts the target at 75% to 85% with a no-show rate under 5%. (Scale Suite, December 2025) Allie, an analytics platform that says it draws on 350 or more Australian clinics, sets 80% or better as the target and flags anything under 65% as low, with a cancellation target under 10% against what it calls an industry average of 18% to 22%. (Allie, fetched September 2026) The UK Private Practice Barometer, from 715 clinic owner responses, found an average diary utilisation of 72.3% and an optimal band of 70% to 80%; above 80%, patient wait times rose 41%. (HMDG, March 2026)

The arithmetic on one practice

Four clinicians, each rostered for 30 clinical hours a week, 44 working weeks a year, an average of $120 billed per hour across private, health fund and NDIS work. That is 5,280 available hours. At 70% utilisation you bill 3,696 hours, or $443,520. At 75% you bill 3,960 hours, or $475,200. Every five points of utilisation is worth about $31,700 a year at $120 an hour, and about $50,000 at the NDIS therapy rate. Nobody had to hire, move premises or run an ad to get it.

Pull your own number from your practice software before you read on. Cliniko, Halaxy, Splose and Nookal all report billed hours against the roster by clinician. If you cannot get it in ten minutes, that is the first thing to fix.

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How do you stop cancellations becoming gaps?

Book the next appointment in the room, remind by SMS, charge for short notice, and keep a waitlist next to the diary.

A physiotherapy practice owner told the APA’s InMotion that cancellations at his clinic went from one in eleven appointments before COVID to one in four in 2022, then back to about one in seven by 2024 after three changes: a written plan of care for every patient, booking the next appointment before the patient leaves the room, and a recall call or text for anyone who dropped off. (APA InMotion, July 2024) That is the whole playbook for most practices. The rest is detail.

Reminders work, and the evidence is Australian

A randomised trial across two Australian public hospital physiotherapy outpatient departments (679 patients) found non-attendance of 11% with an SMS reminder against 16% without. Patients who got no reminder were 1.6 times more likely to miss. (Taylor et al, Archives of Physical Medicine and Rehabilitation, 2012) Every practice management system sends these. Check yours goes out 48 hours ahead with a reply option, not 24 hours ahead with none, because 24 hours does not leave time to fill the gap.

Charge for short notice, and say so up front

Under the NDIS Pricing Arrangements, a cancellation with less than two clear business days’ notice is a short notice cancellation, and a provider can claim up to 100% of the agreed fee where it could not find other billable work and the service agreement says so. (NDIA, Pricing Arrangements and Price Limits, current at September 2026) Private and health fund patients need the same rule in plain words on the website, the intake form and the reminder text. Ahpra’s advertising guidelines only ask that any terms are stated clearly. (Ahpra, Advertising guidelines, December 2020) A fee you never enforce is the same as no fee.

Keep the waitlist next to the diary, not in a drawer

Cliniko, Halaxy, Splose and Nookal each have a waitlist. Cliniko’s captures appointment type, preferred days, practitioner and urgency and filters against open slots; Splose’s books from a calendar gap and sorts by longest waiting; Nookal’s can bulk SMS everyone on the list about new availability; Halaxy’s moves a waitlisted patient into an appointment and sends the invite. (Cliniko, Splose, Nookal, Halaxy, help documentation fetched September 2026) None of the four offers a gap to the waitlist on its own. Someone on the front desk has to do it, so make it a named job: when a cancellation lands, the waitlist gets worked before anything else. Most practices we look at have a waitlist with 30 names on it and a Thursday with four gaps, and the two have never met.

If your front desk is already at capacity and this is the job that never happens, tell us what you need. Building the cancellation-to-waitlist step so it runs without a human is a two-week piece of work.

Tell us what you need

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How do you fill the gaps that are already there this week?

Three lists in your software will fill most of them without a dollar of marketing.

1. The waitlist, worked by gap. Open Thursday, find the gap, filter the waitlist to that practitioner and day, and text the top three names. First to reply gets it. Ten minutes a day.
2. The recall list. Every patient who finished a plan of care three to six months ago, or who cancelled and did not rebook. Cliniko calls these recalls, Nookal automates them after a completed or missed booking, Halaxy runs them as campaigns, Splose exports the lapsed list. One text: “It has been four months since your last visit with Sam. Sam has a spot Thursday at 2pm if it would help to check in.” We cover the numbers behind this in rebooking rate and patient reactivation. If nobody on the desk has time, the Rebook Sprint works the list for you.
3. Patients with Medicare sessions left this calendar year. Since 1 July 2025 a GP Chronic Condition Management Plan lets a patient use up to five allied health sessions a calendar year, and the referral lasts 18 months. (APA, Changes to Medicare chronic disease management, 2025) Run a report on every plan patient who has used two or three of the five. Those sessions expire on 31 December. The patient loses the rebate and you lose the visit. A text in October fills November.

Then offer telehealth for the slots that stay empty at 8am and 4:30pm. A follow-up review by video takes 20 minutes, suits a patient who would have cancelled for work, and bills under most funding streams. Halaxy, Splose and Zanda have it built in; Cliniko and Nookal run it through a partner.

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How do you create demand for the slots that stay empty?

Only once intake stops leaking. Then condition pages, Google Business Profile and referrers, in that order.

Before you spend on demand, test the leak. Ring your own practice at 12:45 on a weekday from a number the front desk does not know. Fill in your own website form on a Saturday and time the reply. Try to book a new patient appointment online for tomorrow afternoon. If any of those fail, you have found where the empty slots are coming from and it is not the marketing. Fix that first; it is where our booking and membership systems work starts.

Once enquiries land, the cheapest demand comes from being found for what you treat, where you are. Patients search a condition and a suburb (“shoulder physio Robina”, “paediatric OT near me”), and increasingly they ask ChatGPT or Google’s AI Mode the same question. A practice with one page per condition or service, each carrying the funding it accepts and a booking button, plus a complete Google Business Profile, wins those searches over a practice with a single “Services” page. GPs and support coordinators refer to people, so a referrer page that names each clinician, what they take and how fast they can see someone fills slots from the other direction.

Paid ads come last. They work when the page they land on books an appointment and the front desk answers. Run them into a leaking intake and you pay for the leak. See Google Ads for allied health practices for what a working setup looks like and what it costs per booking.

Buying ads into a phone that rings out fills nothing. Fix the leak, then buy the demand.

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What do you measure each Monday?

Five numbers, by clinician, on one page. If you track twenty you will stop looking.

1. Utilisation last week, by clinician. Target 75% to 85%.
2. Cancellation rate, and how many of those cancellations rebooked. Target under 10% cancelled, under 8% cancelled and not rebooked.
3. New enquiries and how many became a first appointment. If fewer than half convert, the leak is in intake.
4. Gaps filled from the waitlist or recall list. If the number is zero, the job is not happening.
5. Open slots in the next seven days, by clinician. This is the one you act on today.

Every practice management system can produce the first three. The fourth and fifth usually need a small report built once. That, and the automation behind the waitlist and recall steps, is the kind of work we do for practices under practice automation. If you want a plain read on which of the three causes your empty slots come from, tell us what you need and we will answer from your numbers.

Tell us what you need

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