Final answer:
The governmental agency most closely involved in the development of healthcare data sets and information standards is the Agency for Healthcare Research and Quality (AHRQ). AHRQ is responsible for promoting evidence-based healthcare practices, improving patient safety, and supporting healthcare research.
Step-by-step explanation:
The governmental agency most closely involved in the development of healthcare data sets and information standards is the Agency for Healthcare Research and Quality (AHRQ).
AHRQ, a division of the U.S. Department of Health and Human Services, is responsible for promoting evidence-based healthcare practices, improving patient safety, and supporting healthcare research.
Through initiatives like the Healthcare Cost and Utilization Project (HCUP), AHRQ collects and analyzes healthcare data to address issues related to quality, access, and costs of healthcare in the United States.