An appointment reminder SMS is a short text, sent automatically before a booking, that gives the patient the date, time and place and makes it easy to confirm or change. For most Australian clinics, a good starting point is two texts: one a day or two ahead, while there's still time to refill the slot, and one on the day. Keep each message short, put your clinic name in it, tell the patient exactly how to reply, and leave out anything sensitive.
This guide is for practice managers and clinic owners who want reminder texts that work and stay on the right side of Australian spam law. It covers what to include, when to send, how the Spam Act 2003 applies, copy-ready templates, and what to do about the replies and calls that follow. It also covers where an AI receptionist fits, because a reminder text often ends in a phone call.
What an appointment reminder SMS should include
The best reminders are boring. A patient should be able to read one on a lock screen and know what to do. Every reminder should have:
- Your clinic name, so the text isn't mistaken for a scam or a wrong number
- The patient's first name, if your system holds it correctly
- The day, date and time, written out ("Tue 3 Nov, 2:30pm") rather than as a numeric date that could be misread
- The practitioner and location, if you have more than one room or site
- One clear action, such as "Reply C to confirm" or "Call us on 07 5555 0123 to change"
- A short rule where it matters, such as your cancellation notice period or "bring your referral"
Two practical limits matter. The first is length. Cliniko's help centre notes that its SMS reminders usually cost one credit and that going past 160 characters costs an additional credit, so concise wording saves money as well as reading time (Cliniko Help: set up SMS appointment reminders). Check how your own provider counts. The second is privacy. A text can be read by anyone holding the phone, so don't put the reason for the visit, a diagnosis or a treatment name in it. "Your appointment with Dr Nguyen" is enough. For mental health and other sensitive services, our psychologist answering service guide covers keeping client contact details and messages to the minimum.
When to send appointment reminders
There is no universally correct schedule, and you should be wary of anyone who promises a fixed percentage drop in no-shows from one. What works depends on your appointment type, how far ahead people book and how quickly you can refill a gap.
A widely used pattern is a reminder around 24 hours ahead and a second a few hours before. Sinch Engage (formerly MessageMedia) describes that sequence on its Australian page, suggesting a reminder 24 hours before so clients can plan or reschedule, and a follow-up two to four hours before (Sinch Engage: SMS for appointment reminders). Practice software often lets you go earlier. Cliniko, for example, lets you schedule reminders up to nine days ahead and skip weekends.
Here's a sensible starting point for a clinic, to adjust with your own data:
| Message | When to send | What it's for |
|---|---|---|
| Booking confirmation | Straight after booking | Confirms the details and gives a way to change them |
| Early reminder | 2 to 3 days before | Gives time to reschedule and for you to refill the slot |
| Day-of reminder | Morning of, or 2 to 4 hours before | Catches simple forgetfulness |
| Preparation note | When forms or fasting apply | Sends the one thing the patient needs to do |
Send at sensible hours (mid-morning to early evening), avoid weekend reminders for early Monday bookings, and give long slots more notice than short reviews. Then track your own no-shows and late cancellations before and after any change.
Spam Act 2003: what Australian clinics need to know
This section is general information, not legal advice. Check your own obligations with your professional body, insurer or a lawyer.
Australian spam law is set out in the Spam Act 2003 and administered by the Australian Communications and Media Authority (ACMA). The rules apply to commercial electronic messages, which includes SMS. ACMA's fact sheet says that if a message offers, advertises or promotes a product or service it must comply with spam law, and that this can be just one part of the message (ACMA: email and SMS unsubscribe rules fact sheet).
Is a reminder a commercial message?
A plain reminder that says who you are, when the appointment is and how to change it is information about a booking the patient already made. On ACMA's test it isn't offering or promoting anything. The risk comes from what gets added. A reminder that also says "book your next check-up now" or advertises a new service has a commercial element, and that part of the message is caught. The safest approach is to keep reminders purely about the booking and build them so they'd meet the consent, sender and opt-out rules anyway.
Consent
ACMA says that to send marketing messages you must first have consent, and that it's up to you to prove it. It describes express consent (ticking a box, filling in a form, agreeing over the phone or face to face) as best practice, and inferred consent as possible only where the person knowingly gave their details and would reasonably expect the messages. You also can't send a message asking for consent, because that is itself a marketing message (ACMA: avoid sending spam).
For a clinic, that points to a simple habit: collect the mobile number and the patient's agreement to receive texts at booking, on the form or on the phone, and record when and how they agreed. ACMA also says that if someone else sends messages for you, you still need consent for each person, so check who sends your reminders and what they record.
Identify the sender
ACMA says a message must accurately identify your name or business name and include correct contact details, even when someone else sends it for you, and that this information must stay correct for at least 30 days after sending. Put your clinic's name in every text, with a phone number patients can actually reach.
Make it easy to opt out
For commercial messages, ACMA says the unsubscribe option must be clearly presented, honoured within five working days, free of any fee, no more costly than a standard text, working for at least 30 days after the message is sent, and must not require a login, an account or extra personal information. It gives "Reply STOP" as an example of clear SMS wording. It also notes that alphanumeric sender IDs, where a name shows instead of a number, generally can't receive replies. If your reminders come from one, patients can't reply C or STOP, so give them a number to call.
In practice, add an opt-out to any message with a commercial element, and make sure a stop request switches off that patient's texts in your system.
Appointment reminder SMS templates for clinics
Copy these and swap the placeholders. They're written in Australian English and each is under 160 characters before the merge fields are filled in, so check the length with real names and dates.
Standard reminder with confirm
Hi [First name], reminder of your appointment at [Clinic] on [Day, date] at [time]. Reply C to confirm or call [phone] to change.
Two-way reminder with reschedule
Hi [First name], you're booked at [Clinic] with [Practitioner] on [Day, date], [time]. Reply C to confirm or R and we'll call you to reschedule.
Phone-only change (sender ID can't receive replies)
[Clinic] reminder: [First name], you're booked [Day, date] at [time]. To confirm or change, please call [phone].
First appointment with forms
Hi [First name], welcome to [Clinic]. Your first visit is [Day, date], [time]. Please complete your forms before you arrive: [link]. Questions? Call [phone].
Test each template on real phones before it goes live, keep promotions out of the same message, and use one call to action per text. If you need a link, use your own domain so patients trust it.
How to reduce no-shows beyond the text
A reminder only works if the patient can act on it. Look at what happens after the text lands:
- Make confirming one step. A single-letter reply or one-tap link beats "call us during business hours".
- Handle the replies. If a patient replies "can't make it" at 7pm and nobody reads it until Friday, the reminder has created a cancellation without a refill. Decide who reads replies and when.
- Refill gaps quickly. Keep a waitlist and a script for calling the next suitable patient. Our physio answering service guide and allied health answering service guide both cover waitlist callbacks.
- State your cancellation policy at booking. A reminder that restates it works better than one that introduces it for the first time.
- Check phone numbers. Landlines, old numbers and typos mean the reminder never arrives, so confirm the mobile at check-in.
- Ask how each patient wants to be contacted, and record the preference.
Be careful with promises. Reminders and waitlist callbacks help, but no provider can guarantee a particular percentage reduction, and you shouldn't put one in your own marketing.
Where an AI receptionist fits
Most reminders come from your practice management or booking software, which is the right place for them because it knows the diary. The gap is just after the text goes out. Patients ring to confirm, to say they're running late or to ask to move the appointment, often while your team is with other patients, at lunch or after hours. If that call goes to voicemail, the reminder has created a problem instead of solving one.
That's where an AI receptionist helps. Miyai is an AI receptionist built for Australian small businesses, including clinics. It answers calls in your clinic's name, takes the patient's name, number and reason for calling, and reads the details back. Within the rules you set, it can handle booking and rescheduling requests, and it sends you a summary so your team can follow up. See how AI receptionists work, AI receptionist appointment booking and the medical clinics page. For callers you miss completely, missed call text back covers sending a short SMS afterwards, including the Spam Act basics.
Miyai doesn't replace your reminder system. It covers the calls and chats your reminders produce. The Growth voice plan is $199 AUD/month and website chat is $19 AUD/month. See pricing for what each includes.
FAQ
When should you send an appointment reminder SMS?
There's no single best time. A common pattern is one reminder about 24 hours before and another two to four hours before, and many clinics add an earlier one 2 to 3 days out so there's time to refill a slot. Test your own schedule and compare no-show rates.
Do SMS appointment reminders need consent in Australia?
The Spam Act 2003 applies to commercial electronic messages, and ACMA says you must have consent before sending marketing messages and be able to prove it. A plain booking reminder isn't promotional, but collecting the patient's mobile number and agreement at booking is still good practice. This is general information, not legal advice.
Does an appointment reminder SMS need an unsubscribe option?
Commercial messages need a working opt-out that's honoured within five working days and costs nothing beyond a standard text. A reminder that only covers the booking isn't promotional, but a "Reply STOP" line is a low-cost safeguard, and you need one if you add anything promotional.
Can an AI receptionist send appointment reminders?
Your practice or booking software normally sends the reminder. An AI receptionist like Miyai covers what follows: answering the calls and chats from patients who want to confirm, reschedule or ask a question, and passing the details to your team.
Next step
Pick one appointment type, write its two reminder texts from the templates above and check your consent step at booking. Then make sure the phone gets answered when patients respond. When you want Miyai answering your clinic's calls, Get started.