Table 1 Procedures and ICD-9-CM codes used to define infants with surgical NEC

Intestinal resection procedures

45.02-3, 45.1, 45.29, 45.3-4, 45.41, 45.49, 45.50-2, 45.60-3,

45.70-9, 45.8, 46.99

Procedures related to stoma creation

46.0 – 46.64

Intestinal anastomosis

45.9 – 94, 46.73-79, 46.93-4

Exploratory laparotomy

45.0, 45.00, 54.11

Percutaneous abdominal drainage

54.91