Hospital-level variation in rates of postpartum hemorrhage in California.

Background: To examine the extent of hospital-level variation in risk-adjusted rates of postpartum hemorrhage (PPH).

Study Design And Methods: We performed a cross-sectional study examining live births in 257 California hospitals between 2011 and 2015 using linked birth certificate and maternal discharge data. PPH was measured using International Classification of Diseases Codes version 9.