Hi Oliver. You mentioned you're on Quinn's Plan B Excess plan, but I presume this is their Essential Plus Excess plan. If it's a different plan though, then the cover might be different than I mention below.
Firstly, you'll probably need to pay for the GP visit and the consultant visit. You won't get anything back on your plan, unless you have a lot of other out-patient expenses. However, if you're a PAYE worker you can claim tax relief on these, at 20%.
For the procedure itself, Quinn have different levels of excesses. Public hospitals have no excess, private hospitals have excesses of either €50 or €125, and hi-tech hospitals have an excess of €200. The hospital lists are on their website
here, so you can check the excess before you even see the consultant. A mole removal is usually a day procedure, and other than the excesses, your plan fully covers all of Quinn's hospitals for day procedures.
You can also check if your consultant is fully covered by Quinn at that link as well. The vast majority of consultants are fully covered, but a few opt out of the full cover scheme.
One other thing to consider is that the treatment needs to be medically necessary in order to be covered. I've seen a few cases of people getting a mole removed for cosmetic or preventative reasons, and that's not necessarily covered. Your GP will give you a better indication of the medical necessity, if you haven't already spoken to them.
Finally, as Dr Moriarty suggests, you should also contact Quinn after getting a hospital appointment to make sure that there's nothing else to consider. It's not mandatory, but it gives you that piece of mind. It also means that there's a record of Quinn telling you that you are or you're not covered, should you need it in the future.
Sorry for such a long answer to such a short question, but shout if you have any more questions.