I am an MD as well. This spring I took care of a young men with and asthma attack and tachycardia on a red eye from PDX to IAH on CO. He was slightly overdosed with a salbutamol aerosol and there was no need to divert, but I spent quite some time with that patient.
The crew was very nice and all flight attendants thanked me after the flight. After I didn’t hear anything from CO for three month I email and shortly after they gave me 5000 bonus miles and a nice but generic letter.
I haven’t been an MD for too long, so I hadn’t had the chance to help before. But from what I here from some more senior MDs here in Germany is that LH, AF and SAS sent them nice presents (e.g. Champange or some nice wine) and miles. So I was a little disappointed with that.