Deck Joist Hanging Options
Yes, by code you can raise the top of the beam to be at the top of the decking. However, 1) it will give you a “pattern” on your deck that you probably won’t like, 2) you’ll need to strap the two sides together, because you’re relying on withdrawal to keep the deck together. Usually we run the decking across the beams and then the decking acts as a “strap” too. 

Also, having the top of your “built-up” beam exposed will allow moisture to lay between the members and cause dryrot. Having the deck on top of you “built-up” beam will “protect” the members and keep moisture out. 

Where you live with seismic D2 requirements, you’ll need diagonal braces (especially that high in the air) and the code now requires a minimum of 2 hangers like this to attach to the house:

http://embed.widencdn.net/pdf/plus/ssttoolbox/sonpfljoja/F-DECKCODE17-p019.pdf

Also, consider using stainless steel hangers with either pressure treated or cedar or redwood lumber for longevity.