S&P Global Ratings affirmed the "A" rating on Abilene, Texas-based Hendrick Health Systems' series 2009A, 2009B, 2013 and 2015 bonds.
The outlook was revised to positive from stable.
"The outlook revision reflects Hendrick's continued healthy operations and debt service coverage and the recent completion of several capital projects designed to bolster the system's market position," said S&P Global Ratings credit analyst Patrick Zagar.