S&P Global Ratings upgraded the long-term rating to "AA-" from "A+" on Ann & Robert H. Lurie Children's Hospital of Chicago's series 2008A fixed-rate bonds and series 2008B fixed-rate bonds.
S&P also assigned an "AA-" long-term rating to the hospital's $133.13 million of series 2017 fixed-rate bonds.
"The rating action reflects our view of Lurie Children's strengthening financial profile and improving business position," said S&P analyst Suzie Desai.
The outlook is stable, reflecting S&P Global Rating's expectation Lurie Children's Hospital will maintain its business position, improved balance sheet and solid cash flow margins.