health insurance denies APAP.., What to do next?

Old Lincoln -- Why not start a separate thread about buying off from cpapauction to see your responses? You may have more people respond.

The one I purchased is a 418A.

I was skeptical at first about buying used cpap equipment, but for those on a budget it only makes sense as new costs so much.

One thing I highly recommend is when buying from on line auction sites check the seller's feedback carefully. I do not want to buy from anyone that has less than 99% feedback (my own opinion). The exception is new sellers that have just a few feedback -- one negative can screw with the average.

Read the ad very carefully -- read between the lines as well. Some phrases jump at you and should be reviewed prior to bidding in my opinion. An example might be -- used for a few months (if it is a mask) might just mean worn out and needs pitched but I will let someone else do that. Of course that isn't always the case and are the exception but that exception still exists.

I was in the same situation regarding the timing of my original M-Series Plus. I had it about 10 months, and the rental was capped out. I also wanted a data capable machine, and tried to see if they would "upgrade" the Plus. No dice. I wanted an APAP with Aflex so I went to CPAP.com and bought it.

Then, I made a submission to my insurance compnay, which included:

A letter of medical necessity from my sleep doc.
An Rx for APAP from same doc.
The results of my sleep study on CPAP which showed a high AHI. (15 or so)
The results from my new Aflex which showed a much improved AHI.
The paid invoice from CPAP.com, and finally,
A cover letter tying the whole thing together.

Bottom line, they paid for the whole thing even though my first machine was only a year old.

So, the best advice I can give is put a compelling story together, with as much information as you can show (simplified of course for easy reading).

Line up those ducks!