Final answer:
Starting January 1, 2007, critical care services will be paid in one level. This is a flat rate system covering all services provided to critically ill patients within a day.
Step-by-step explanation:
The question pertains to the payment structure of critical care services in the healthcare system as of January 1, 2007. The correct answer to how many levels will critical care services be paid in starting on January 1, 2007 is One. Critical care services are typically billed in one flat rate regardless of the time spent, unlike other medical services that may have tiered billing based on duration or complexity. This involves a comprehensive service provided to a critically ill or critically injured patient for a period of time in a day by a physician(s) to stabilize their condition.