Can weight loss lead to sleep apnea rating decrease?

Theoretically, yes but I've only heard of people saying " I let a lot of weight so im off my CPAP" and that was in fitness magazines, so....

It might, just based on one of the causes of OSA, but there are other things that can contribute to OSA specifically. I know thin people on cpaps. 

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"If" your OSA (Obstructive Sleep Apnea) "actually improved under ordinary conditions of life", and it was "sustained improvement", then, yes, it could result in a reduction.  

VA can schedule "future exams" for any condition.  

However, they are not supposed to schedule (re exams, for purposes of reduction) If you are over 55 or P and T, "under ordinary circumstances".  

What I have seen is that you normally order masks for a cpap at least once a year if you are using it.  If you dont use it, no.  

Its likely gonna be a red flag if you stop using the cpap masks and or stop seeking treatment for OSA.  

Not to mention potentially deadly. I fell asleep last night without my mask on and my acid reflux woke me up choking- in part because my CPAP helps control that as a side effect of forcing my airway open. 

@mb76 Welcome to Hadit!

As @brokensoldier244th indicated knowing a bunch of skinny people on CPAP machines, I'm one of those borderline people - not thin, not heavy. He's correct about the CPAP helping with other conditions like reflux. I also have chronic sinusitis/rhinitis. That CPAP machine helps to keep my sinuses open while I sleep. Even if I lost more weight and ended up not actually needing to wear it from an apnea perspective, I probably would continue to wear it to keep my sinuses open.

When I had my sleep studies, they started me off without the mask to determine if I was having apneas. After they noticed them happening, they put the mask on and the number dropped.

My machine is a Philips Dreamstation and I connected it to my phone via Bluetooth. In the app, I can produce a report showing the number of apneas (AHI) for each night. Sometimes I have very few, other times I have a bunch. My machine does call into the VA daily to report the previous night's results, so I don't have to bring in the SD card and have it read every six months. 

If the VA wanted to reduce you, it may be due to non-compliance if you are not using the machine as prescribed.