Sounds like minor surgery and I assume you won't be out of action for more than 7 days, so my advice would be to get it done, and carry on as normal. Raise it now and you risk Avmed grounding you, because of course they would know more than a mere 'specialist' wouldn't they
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As Old Akro said though, when you do your next medical there will be a question that requires you to own up (or not). At least if you do it then, any further testing etc that Avmed demand can be done (hopefully) in the 2 months after your medical is re-stamped so you don't have any CASA induced downtime.
Further reading available on CASA website. If you google 'pilot illness 7 days' or similar it should take you to the relevant part. Best of luck.