Final answer:
The correct code or codes to report Ellis' admission into Cengage Hospital with HIV-related lobar pneumonia are option 3) J18.1, Z21.
Step-by-step explanation:
The correct code or codes to report Ellis' admission into Cengage Hospital with HIV-related lobar pneumonia are option 3) J18.1, Z21. This is because J18.1 represents the diagnosis code for lobar pneumonia, which is the condition Ellis has been admitted with, and Z21 represents the code for HIV-positive status, which indicates his HIV diagnosis. Therefore, these two codes accurately capture Ellis' current health condition.