I cannot wrap my head around the appropriate way of billing 76942 along with cpt codes 20552 + 20553.

We are doing an 20552/20553 injection in place of service 11. We have been receiving denials on 76942 from BCBS, Medicare, etc…

According to the cpt code book, 76942 can be reported with 20552/20553.

Are there any specific guidelines to 76942 and 20552/20553? Does it require medical necessity or a modifier on 76942?