Necrotizing enterocolitis (NEC) is a disease common in premature neonates with a peak incidence between 21 and 28 days. When this condition first presents in the neonatal period, International Classification of Diseases, 10th Revision, Clinical Modification (ICD-10-CM) codes in P77 are reported for related care even if that care continues after the infant is no longer considered a neonate (29 days after the day of birth and older). An exception to the use of category P77 codes for neonatal NEC is the diagnosis of pseudomembranous enterocolitis or NEC due to Clostridium difficile (A04.7). Also, cases of NEC do occur after the neonatal period. Codes in category P77should not be used for reporting NEC when onset is beyond the neonatal period (29 days or older).

The alphabetic index of ICD-10-CM provides guidance for selecting the correct codes.

Note the sub-term, ischemic (K55.9), under the...

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