Hmm, I'm struggling actually, though it should be simple. Must be Mondayitis.

The treatments are grouped according to the medical problem/issue and the risk factor. These groups are designated a procedure e.g. monobrow removal or implanting a funny bone.

Was mich irritiert ist, dass es anscheinend keinen Unterschied zwischen Gruppierung und Leistungsbereiche gibt. Wenn die identisch sind, dann etwas wie unten klingt logischer.

The treatments are grouped into procedures e.g. knee reconstruction or hernia treatment according to the underlying medical issue and the risk factor. Patients are then billed a flat-rate depending on the procedure used.

Thanks HappyMan.

If fact, I wasn't looking for a translation of my explanation of "Leistungsbereich", but rather a translation of the the term: "Leistungsbereich"

Weitere Vorschläge werden gerne angenommen

Yes, I had missed that. I will now accept that you are not a troll despite earlier appearances but fail to understand why you felt the need to comment on a clearly flagged medical thread when you were -- by your own admission -- struggling. I was merely agreeing with you. Rainman_1 asked a serious question, so in the spirit of us all getting along, I'd appreciate it if you kept your comments free of such things as 'monobrow removal or implanting a funny bone'. My apologies if you were not trying to be amusing. Any corrections were intended to be useful for other readers in the future, not just picking you up on poor translations.

Having cleared the air, I am sure we will now get on like a house on fire.

@Marianne, As I stated in my original post, I was struggling because of the inaccuracies in the supporting sentence, which turned out not to be from some source, but just an explanation offered by the OP. As the specific illnesses were irrelevant to the requested translation, I thought it ok to put a small joke in there. I think in the future, I will occasionally do that, as it is part of my character, I hope you can live with this. It is clearly not an attempt to mislead anyone.