Respiratory Equipment Policy and Administration Manual - Section 335.01: The individual must have polysomnographically documented OSAS where there is a change in pressure of a minimum of 4 cmH2O on a prescribed fixed CPAP level of 10 cmH2O or more; and the change must occur between REM vs. NREM sleep or supine vs. sleeping on their side.
On the other hand, ADP will pay $860 toward any CPAP machine. From ResMed, that means either a Resmed AirSense 10 CPAP or Elite model. The Elite model does supply full efficacy data; the CPAP model gives only limited compliance data. You want the Elite or Autoset model. (The AirStart models are not currently listed.) From Respironics, the Dreamstation CPAP again gives only limited compliance data. The Dreamstation CPAP Pro gives full efficacy data, and the Dreamstation Auto APAP does, as well.
There are additional requirements for obtaining ADP funding for xPAP equipment. The above manual can be found at http://www.health.gov.on.ca/en/pro/progr...tions.aspx
I suspect most insurance companies will require you to take advantage of the ADP program; OTOH, if you are going it alone, there is no reason why you should be restricted, as long as your doctor will write an APAP prescription.
I haven't run any of this past my DME, but if you can't get at least the Elite or CPAP Pro, you should go elsewhere. There is (of course) a list of ADP approved suppliers. Google 'assitive devices program' and poke around to find it.