CPAP question

I, too, use a CPAP. I have a dozen flights to Europe under my belt and I have never had an issue with it. I have never bothered to bring a doctors note, just place it in my backpack as a carry on. My European entry points are usually London, Paris, and Amsterdam though, not Germany. I would'nt worry about it.

My father travelled with one in his carryon luggage. It was inspected, but no note for the machine or his prescription medications was requested. The only issues are with powders, pastes and liquids in non-allowable limits - but you don't need prescriptions for these, either.
The main thing is to make sure that you have proper adapters which will handle the load for your machine. My father didn't, and his burned out the first night. We were lucky to be able to replace it fairly quickly.

It's medical equipment, doesn't count as luggage. I traveled with a friend who uses one, no one ever asked for verification (4 flights).

SJC: I have traveled multiple times to Europe with my CPAP. The concern is generally at the departure airport and not the arrival airport. You will be screened upon departure from the US and the DHS security folks are quite familiar with CPAP machines. When I have traveled by air within Europe, I have not had any screening problems with the security folks at the various airports. I have a letter from my doctor and prescription for the CPAP, but I have never had to show them. I would recommend that you review in advance the procedures for on-board baggage for each air carrier and ensure that you understand them, meet them, and will be in compliance with them. Depending upon the air carrier, they may want to know make, model, serial number of the CPAP and they will enter it into their system and will consider the CPAP as a medical device and as an additional in-cabin piece of baggage (without charge). Take an extension cord as your bed may not be situated near an electrical outlet; and, ensure you have the correct plug adapter. Also, check your CPAP power source to ensure it supports a voltage range between 100 and 240V--most newer models do, so this shouldn't be an issue; however, if it is, you will need a voltage adapter as well. Enjoy your trip.