Massachusetts-based Cape Cod Healthcare's credit rating will be lowered in a report set to be released by bond rating agency Standard & Poor's. The report will lower the hospital system's rating one grade from BBB to BBB-, just above ratings that are considered speculative, or "junk" bond level. But the rating agency also upgraded its long-term outlook for Cape Cod Healthcare from negative to stable, in part because of its confidence in Richard Salluzzo, MD, the chief executive of the chain since July.