Table 1.

International Classification of Diseases, Ninth Edition, Clinical Modification (ICD‐9‐CM) and Clinical Classifications Software (CCS) Codes Used to Identify Co‐Morbidities and Outcomes

Variable	Source	Code(s)
Co‐morbidities*
Tobacco use	ICD‐9‐CM	305.1
Dyslipidemia	CCS	53
Atrial fibrillation	ICD‐9‐CM	427.31
Pregnancy‐associated HTN	ICD‐9‐CM	642.3x
Pre‐eclampsia	ICD‐9‐CM	642.4x, 642.5x
Eclampsia	ICD‐9‐CM	642.6x
Antepartum hemorrhage	ICD‐9‐CM	641.0x to 641.9x
Multiparity	ICD‐9‐CM	659.4, V61.5
Multiple gestation	ICD‐9‐CM	651.0x to 651.9x, V27.2 to V27.7
Outcomes
Cardiac arrest	ICD‐9‐CM	427.5, 99.60, 99.63
Heart transplant	ICD‐9‐CM	37.51, 33.6
Mechanical circulatory support	ICD‐9‐CM	37.60, 37.61, 37.62, 37.65, 37.66, 37.68, 39.65
Acute pulmonary edema	ICD‐9‐CM	518.4, 428.1
Thromboembolism	ICD‐9‐CM	451.11, 451.19, 451.81, 451.83, 451.89, 453.2, 453.4x, 453.8x, 671.3x, 671.4x, 671.5x, 415.1x, 673.2x, 557.0, 444.0x, 444.1, 444.2x, 444.8x, 593.81, 433.01, 433.11, 433.21, 433.31, 433.81, 433.91, 434.0x, 434.1x, 434.9x, 436, 410.0x to 410.9x, 411.1, 411.8x, 429.79
ICD implantation	ICD‐9‐CM	37.94, 37.95, 37.96, 37.97, 37.98, 00.51, 00.54
PPM implantation	ICD‐9‐CM	37.70 to 37.79, 37.80 to 37.89, 00.50, 00.52, 00.53
Cardiogenic shock	ICD‐9‐CM	785.51

HTN indicates hypertension; ICD, implantable cardioverter defibrillator; PPM, permanent pacemaker.

^*Other co‐morbidities such as chronic hypertension, diabetes mellitus, alcohol abuse, anemia, rheumatoid arthritis/collagen vascular diseases, chronic pulmonary disease, coagulopathy, depression, drug abuse, hypothyroidism, liver disease, malignancy, fluid and electrolyte disorder, paralysis, other neurological disorders, obesity, peripheral vascular disease, psychoses, pulmonary circulation disorders, and chronic kidney disease were identified using the Agency for Healthcare Research and Quality co‐morbidity measures software.