Which of the following codes are temporary codes for procedures, services, and supplies in HCPCS Level II?

G codes are indeed the correct answer as they are classified as temporary codes in the HCPCS Level II coding system. These codes are primarily used to represent specific procedures, services, or supplies that may not have a permanent code assigned yet or are used to report specific situations. G codes can also be utilized for Medicare reporting purposes, especially for outpatient therapy services.

The other code categories serve different functions within the HCPCS system. C codes are used for temporary hospital outpatient reporting and are particularly relevant for new technology procedures. A codes are used for durable medical equipment, while J codes are used for drugs and biologicals administered by injection. Each of these code types has a specific purpose and context for usage, differentiating them from the G codes that are specifically designed for temporary use.