Short Answer
A physical therapy prescription cannot be extended or used for billing once the 28-day statutory start window has expired.
You must physically return to your general practitioner to have an outdated voucher completely reissued under a new date.
What Most Expats Don't Realize
You waited until day 29 to find an open slot at a physiotherapy clinic because you assumed the start date was flexible. The receptionist rejected your paperwork at the desk, and you had to take an emergency vacation day to wait in line at your GP's office for a replacement. You lost a full day of wages and paid a secondary €20 clinic administrative fee because you didn't know the original order automatically turned into worthless trash.
What To Do
- Call your Hausarzt's reception desk the morning your 28-day window expires to request a "Neu-Ausstellung" (reissue).
- Bring your old physical prescription sheet back to the doctor's office to swap it for the new one.
- "Ich konnte keinen rechtzeitigen Termin finden, können Sie das Rezept neu ausstellen?" (I couldn't find an appointment in time, can you reissue the prescription?) — Say this to the medical assistant to get the paperwork updated.
The Truth
The system locks down digital billing files exactly 28 days after generation. German physicians have zero authority to modify a lapse retroactively, meaning any delay forces a complete restart of the administrative approval process.