[1][2] Prior to the merger, a 1997 agreement had already made Northwest the home for a UW Medicine cardiac surgery program.

[2] In 1949, the "Community Memorial" Hospital Association purchased a 33-acre (13 ha) tract in North Seattle.

In 1985, Northwest Hospital physicians pioneered the ultrasound-guided installation of a radioactive "seed" implant to treat prostate cancer.

[3] In 1993 they were the region's first hospital to offer the non-surgical gamma knife technique of treating brain tumors.

[4] After the UW Medicine merger, Northwest remained a separate nonprofit, tax-exempt entity.