I also have Aetna and I am doing the three month multi-displinary plan. I have my first nutritionist and PCP appointment the first week of August. I have had an appointment with both the nutritionist and PCP the first week of September, October and have plans for Novemeber then my paper work will get submitted.
I tried to get exact details from Aetna when I first started the three month. They told me that it was up to my PCP to interpret the rules to qualify for the three month multi-displinary (helpful, huh!). I decided not to take any chances so I decided to do the full 90 days.
I hope you have success and get approved.