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Fetch the complete documentation index at: https://docs.morf.health/docs/llms.txt

Use this file to discover all available pages before exploring further.

This doc is for anyone building workflows that send communications around appointments — reminders, cancellation follow-ups, or post-appointment review requests. Appointment communication in Morf is flexible: you control exactly when messages fire and what conditions have to be true first. Use the expressions below to build a workflow that fits your practice needs.

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Filter by event type

Use this when you want the workflow to run only when an appointment is booked or changed, not on every appointment event. 
morf_event_type.contains("SCHEDULED") || morf_event_type.contains("UPDATED")
Use these sample prompts with Flo to generate a CEL expression that fits your goals.
Only run this workflow when an appointment is scheduled or updated.

Continue when an appointment is done.

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Check the appointment is still in the future

Use this when you want to make sure you’re not sending a reminder for an appointment that has already passed. 
appointment_datetime.isAfter(morf.now())
Use these sample prompts with Flo to generate a CEL expression that fits your goals.
Only send this reminder if the appointment hasn't already happened.

Skip this appointment if the appointment date has already passed.

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Filter to a specific time window

Use this when you want to send a reminder a specific amount of time before an appointment — like 24 hours before or 7 days before. Start here — common time windows: More than 7 days away: 
appointment_datetime.isAfter(morf.now().add(parseDuration("167h")))
Within 24 hours: 
morf.now().isAfter(appointment_datetime.sub(parseDuration("24h")))
Within 1 hour: 
morf.now().isAfter(appointment_datetime.sub(parseDuration("1h")))
Duration reference:
WindowExpression
10 minutesparseDuration("10m")
1 hourparseDuration("1h")
24 hoursparseDuration("24h")
3 daysparseDuration("72h")
7 daysparseDuration("168h")
30 daysparseDuration("720h")
Days don’t have a shortcut. Write hours instead: 3 days = "72h", 7 days = "168h". If you use "7d", the expression won’t work.
Use these sample prompts with Flo to generate a CEL expression that fits your goals.
Write a filter that passes only if the appointment is between 24 and 72 hours from now.

I want to send a reminder when there are exactly 7 days until the appointment.

I want to send a review request a day after the appointment is complete.

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Timezone-aware time windows

Use this when your patients are in different time zones and you want the reminder timing to respect their local time — for example, only sending if the appointment is more than 72 hours away as of 9 AM in their timezone. Advanced — use only if basic time windows aren’t precise enough for your needs: 
appointment_updated_at.isBefore(
  parseTimestamp(
    appointment_datetime.customFormatInTimezone("2006-01-02", appointment_patient_timezone_identifier.orValue("America/Phoenix"))
    + "T09:00:00"
    + appointment_timezone_offset
  ).sub(parseDuration("72h"))
)
Annotated breakdown: 
appointment_updated_at.isBefore(           // Was the appointment updated before the cutoff?
  parseTimestamp(                          // Convert the cutoff string back to a timestamp
    appointment_datetime
      .customFormatInTimezone(             // Format the date in the patient's local timezone
        "2006-01-02",
        appointment_patient_timezone_identifier.orValue("America/Phoenix")
      )
    + "T09:00:00"                          // Anchor to 9:00 AM local time
    + appointment_timezone_offset          // Apply the UTC offset for that timezone
  ).sub(parseDuration("72h"))             // Go back 72 hours from that 9 AM point
)
Replace "America/Phoenix" with the appropriate default timezone for your patient population, and change "T09:00:00" to the local time you want to anchor to. appointment_patient_timezone_identifier is populated automatically by Healthie.
Use these sample prompts with Flo to generate a CEL expression that fits your goals.
Write a filter that checks if the appointment is more than 72 hours away, anchored to 9 AM in the patient's timezone.

Only send if the appointment is at least 3 days away, based on the patient's local time.

Use the patient's timezone to check if the appointment is more than 48 hours from now.

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Check the appointment hasn’t been cancelled

Use this when you want to verify the appointment is still active before sending a reminder or confirmation. Start here — check the status field directly: 
appointment_status.orValue("") != "Cancelled" &&
appointment_status.orValue("") != "Re-Scheduled"
Advanced — check against a live lookup result: 
list_appts.exists(appt,
  appt.appointment_id == appointment_id &&
  appt.appointment_status == "Confirmed"
)
Use these sample prompts with Flo to generate a CEL expression that fits your goals.
Don't send a reminder if the appointment has been cancelled or rescheduled.

Only send if the appointment status is Confirmed.

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Further reading

For the complete CEL function reference — including all available operators, string functions, date helpers, and optional chaining syntax — see the CEL Reference.