Final answer:
The 2012 OIG work plan includes reviews of Medicare Part B, Part D, Part A, and Part C payments, essential for maintaining the system's viability amid growing healthcare costs.
Step-by-step explanation:
The 2012 OIG work plan highlighted various topics for review, including Medicare Part B payments for chiropractic services, Medicare Part D payments for drugs used in hospice care, Medicare Part A payments for inpatient stays, and Medicare Part C payments for Medicare Advantage plans. This underscores the importance the government places on managing the costs and oversight of healthcare services provided to patients, especially the elderly, disabled, and those receiving assistance through federal healthcare programs such as Medicare and Medicaid. With a growing elderly population and the rise of healthcare expenses, the review of these Medicare parts is crucial in ensuring that the system remains viable and efficient.