Sequencng HCPCS and CPT???

I took the CPC recently (didn't pass it but I"m very close!) and there were some questions that I wasn't quite sure how to answer and I'm wondering if someone cuold help me? I never learned how to sequence HCPCs codes along with CPT.

Example from the top of my head: If a patient comes in for a pneumonia vaccine, do I just code the HCPCS, CPT or both? if I do code the both of them, how do I sequence them?

Sequencng HCPCS and CPT???