How do primary and secondary insurances work?

I have my own employer health insurance and am under 26 so my Dad still carries me on his employer's health insurance. I had an injury a couple months back and have been fighting the bills since. I'm using my insurance as a primary and my Dad's as a secondary, but trying to get these customer service people to actually submit to the secondary insurance has been a pain. Both insurances are aware of eachother and a coordination of benefits shows up on both accounts. My question is should there be a claim submitted to both insurances? I have 7 claims on my primary insurance for this and am expecting to see 7 claims show up on my secondary insurance unless this isn't how it works? My concern with this is my Dad's insurance should provide almost full coverage for everything but I may need to submit an appeal and in order to do that I need a claim number for his insurance. Any help is appreciated.

submitted by /u/billymayseyelashes
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