According to a rating service, Mercy Medical Center - Des Moines provides the best quality health care in its market and ranks No. 24 in the nation, Mercy said in a news release. The service, CareChex, said Mercy was No. 1 in Iowa for treating heart failure (ranked No. 10 in the nation), pneumonia (No. 7 in the nation), pulmonary problems (No. 10 in the nation), and strokes (No. 100 in the nation). Mercy also ranked No. 1 in Iowa for patient safety. CareChex is a medical quality rating service of Comparion Medical Analytics Inc., a health care information company.