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"In general, the U.K. achieves superior performance compared to other countries in all areas except Health Care Outcomes, where it ranks 10th despite experiencing the fastest reduction in deaths amenable to health care in the past decade."

If you look at the graph Exhibit 4. Mortality Amenable to Health Care, 2004 and 2014[1] it shows that for 2014 the UK wasn't 10th. They have taken an average for the decade leading to 2014. So it isn't as clear cut as just being 10th.

http://www.commonwealthfund.org/interactives/2017/july/mirro...