Final answer:
The National Academy of Medicine's 'Leadership by Example' document deals with the issue of inconsistent performance measures across major U.S. governmental healthcare programs. It discusses the broader challenges of the U.S. healthcare system, including cost control and equitable access.
Step-by-step explanation:
The document from the National Academy of Medicine that addressed the duplication and contrasting approaches to performance measures by the six major governmental healthcare programs serving nearly 100 million Americans is 'Leadership by Example'. Considering the healthcare system of the United States, there is an emphasis on high-quality care and innovation, but there are ongoing struggles in managing costs and ensuring access to medical care for all. The sharing of digital records among health providers, as well as finding the right balance between quality, access, and cost, are proposed methods to improve the overall healthcare in the U.S. Compared to other nations, the U.S. may encounter challenges in providing rapid access to care and maintaining the cutting-edge of medical treatment while controlling expenses and extending basic healthcare services to the entire population.