TABLE 2

Maternal Medical Conditions Classification Based on ICD-9-CM Diagnostic Codes on the Hospital Discharge Record or a Maternal Risk or Complication on the Infant Birth Certificate

Maternal Medical Conditions and Pregnancy ComplicationsICD-9-CM Diagnosis Codes From Hospital Discharge RecordBirth Certificate Maternal Risk or Complication Variable
Cardiac diseasea394.0–398.90, 402.91–428.09, 648.51–648.62, 745.5–746.69Cardiac disease
Acute or chronic lung diseasea465.9–493.90, 511.9–518.82Acute or chronic lung disease
Diabetes (gestationala and established)250.00–250.82, 362.01, 648.01–648.02, 648.81–648.82Diabetes, gestational and established
Genital herpes (active)054.10–054.19None
HDP (chronic hypertension, pregnancy-induced hypertension, and eclampsia)a401, 642Eclampsia, chronic and pregnancy-related hypertension
Renal diseasea581.9–593.89, 642.11, 753.12–753.39Renal disease
Antepartum hemorrhage (includes placenta previa and placenta abruptio)a641.01–641.11, 641.2Uterine bleeding, placenta abruptio, placenta previa
Antenatal maternal infection (amniotic cavity infection, unspecified maternal pyrexia during labor, and generalized infection during labor)658.4, 659.2, 659.3Febrile (>100°F or 38°C)
  • a Based on classifications from Lydon-Rochelle et al.11