RSV and synagis cpt coding question


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Hello people, I'm new to this site and I was wondering if anybody could kindly help me out with coding issues I'm having.

I wanted to know the correct way for billing the RSV test and synagis to the insurances below:

1. Maryland Medicaid
2. Amerigroup
3. Priority Partners
4. Maryland Physicians Care
5. United Healthcare

So far I came up with the synagis code being 90378, synagis administration code being 90460 and RSV Test being 87807 but anytime I bill any of these codes to the insurances above, they get rejected.

I recently billed an RSV code to one of the insurance companies I listed above, but instead of typing in the RSV cpt code itself, I just typed in the ICD 9 code V04.82 (which is the need for prophylactic vaccination against respiratory synctial virus) and then the cpt code 99211 but I'm not particularly sure if that was a right approach.

So if anyone could let me know what I'm doing wrong and tell me the correct way to deal with this issue, I would greatly appreciate it.