The Validity of Discharge Billing Codes Reflecting Severe Maternal Morbidity.
Sigakis MJ, Leffert LR, Mirzakhani H, Sharawi N, Rajala B, Callaghan WM, Kuklina EV, Creanga AA, Mhyre JM, Bateman BT. The Validity of Discharge Billing Codes Reflecting Severe Maternal Morbidity. Anesth Analg. 2016 09; 123(3):731-8.