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Table 2 Comparison of NICUS variable codes and ICD9 codes available in the Admitted Patient Data Collection, New South Wales, Australia, 1994–1996

From: Using hospital discharge data for determining neonatal morbidity and mortality: a validation study

  NICUS variable codes Available ICD9 codes
Diagnoses   
Intraventricular hemorrhage (IVH) and other brain hemorrhages IVH was coded as YES (grades 1–4) or NO (none/not examined) A single head ultrasound (HUS) abnormality can be recorded and coded: 0:None; 1:Cerebral oedema; 2:Subarachnoid hemorrhage; 3:Periventricular echogenicity; 4:Cerebellar hemorrhage; 5:Subdural hemorrhage; 6:Extradural hemorrhage; 7:Other; 8 Not examined. 772.1 Neonatal IVH 772.2 Neonatal subarachnoid hemorrhage 767.0 Subdural and cerebral hemorrhages 772.1, 772.2 or 767.0 any brain hemorrhage
  Any brain hemorrhage was coded YES where IVH = YES or HUS in (2,4,5,6) and NO where HUS abnormality of 'none' or 'not examined'.  
Respiratory diagnoses A single 'primary respiratory diagnosis' can be recorded and coded: 0:None; 1:Transient tachypnea of the newborn (TTN); 2:Respiratory distress syndrome (RDS); 3:Meconium aspiration; 4:Immature lung; 5:Apnea; 6:Congenital anomaly; 7: Pulmonary hypertension; 8:Pneumonia; 9:Perinatal surgery; 10:Other; or 11:Unknown 769 Respiratory distress syndrome (neonatal) 770.6 Transient tachypnea of the newborn 770.1 Meconium aspiration syndrome 770.0 Congenital pneumonia 480–486 Pneumonia 416.0 Pulmonary hypertension
  A single 'main indication for initial ventilation" can also be recorded and coded 1–7 as above or; 8:Infection (any site); 9:Asphyxia; 10: Cardiac disorder; 11:Post-surgery; 12:Other  
  Any diagnosis of transient tachypnea, respiratory distress syndrome, meconium aspiration, pulmonary hypertension or pneumonia was coded YES and 'primary respiratory diagnosis of 'none' coded NO  
Retinopathy of prematurity (ROP) ROP was coded as YES (grades 1–4 or treatment for ROP) or NO (none/not examined) 362.21 Retrolental fibroplasia 362.10 Retinopathy unspecified 14.2 Destruction of chorioretinal lesion 36.21, 362.10 or 14.2 coded as ROP
Necrotizing enterocolitis (NEC) NEC coded as YES (clinically diagnosed or proven radiologically/at surgery) or NO (None) 777.5 Necrotizing enterocolitis in newborn
Selected major anomalies Recorded using ICD9 diagnosis codes for any of the following: anomalies of diaphragm, anomalies of abdominal wall, spina bifida, tracheo-oesophageal fistula (TOF), oesophageal atresia and stenosis and tetralogy of fallot (see next column for ICD codes) 756.6 Diaphragm anomalies 756.7 Abdominal wall anomalies 741 Spina bifida 750.3 TOF, oesophageal atresia and stenosis 745.2 Tetralogy of fallot
Procedures   
Continuous positive airway pressure (CPAP) Recorded using 4 variables indicating number of days of endotracheal tube CPAP, nasopharyngeal CPAP, continuous nasal CPAP and intermittent nasal CPAP: 1 or more days of any of these recorded as YES, 0 days recorded as NO 93.90 Continuous positive airway pressure (CPAP)
Mechanical ventilation (including CPAP) Mechanical ventilation or CPAP, YES or otherwise NO 93.90 Continuous positive airway pressure (CPAP) 93.91 Intermittent positive airway pressure breathing 96.7 Continuous mechanical ventilation 93.90, 93.91, or 96.7 for any mechanical ventilation
Drainage of air leak Recorded as air leak requiring drainage YES or NO 34.04 Insertion of intercostal catheter for drainage
Surgery for patent ductus arteriosus (PDA) PDA surgery coded as YES or NO 38.85 Ligation of PDA
Surgery for necrotizing enterocolitis (NEC) NEC surgery coded as YES or NO 777.5 Necrotizing enterocolitis in newborn 45.6–46.5 Operations on the small or large intestine 43.19 Other gastrostomy 54.11, 54.19 Laparotomy 54.59 Lysis of peritoneal adhesions 77.5 and 45.6–46.5, 43.19, 54.11, 54.19, or 54.59 for NEC surgery