Appendix 1.

ICD-9 CM Definitions for Maternal Conditions

	ICD-9 CM Definition
Malignancy	140.x–208.x
Pulmonary hypertension	416.0, 416.8, 416.9
Chronic ischemic heart disease	412.x–414.x
Congenital heart disease	745.0x–747.4x, 648.5x
Valvular heart disease	394.x–397.x, 424.x
Pre-existing hypertension	401.x–405.x, 642.0x–642.2x, 642.7x
Liver disorders in pregnancy	647.x
Systemic lupus erythematosus	710.0x
Drug abuse or dependance	304.x–305.0x, 305.2x–305.9x, 648.3x
Asthma	493.x
Chronic renal disease	581.x–583.x, 585.x, 587.x, 646.2x
Sickle cell disease	282.4x, 282.6x
Diabetes mellitus	250.x, 648.0x, 648.8x
Stillbirth	656.4x, V27.1, V27.3, V27.4, V27.6, V27.7
Severe preeclampsia/eclampsia	642.5x–642.6x
Cesarean delivery	74.0x–74.2x, 74.4, 74.99
Placenta previa	641.0x, 641.1x
Chorioamnionitis	658.4x
Multiple gestation	V27.2–V27.8, 651.x

ICD-9 CM = International Classification of Diseases, Ninth Revision, Clinical Modification.