ICD-10 Code K55.32 – Stage 2 Necrotizing Enterocolitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code K55.32 – Stage 2 necrotizing enterocolitis
What it is
K55.32 identifies stage 2 necrotizing enterocolitis, a serious intestinal condition in which bowel injury is more than suspected but not yet clearly advanced. Use it when documentation specifically states stage 2 NEC.
Clinical signs
Clinical features vary; refer to documentation. Stage 2 NEC is commonly associated with abdominal distension, feeding intolerance, bloody stools, and radiographic evidence of intestinal involvement consistent with the stage described.
When to use this code
Use K55.32 when the provider documents stage 2 necrotizing enterocolitis in a neonate or infant and the record supports that diagnosis. This code fits charted staging terminology, not a general note of possible NEC. Check documentation if the stage is unclear.
Do not use for
Do not use this code for suspected NEC without confirmed stage 2 documentation, or for other stages of necrotizing enterocolitis. Do not assign it if the chart only mentions abdominal symptoms without a documented NEC diagnosis.
Coding tip
Match the exact NEC stage in the provider note and verify whether the diagnosis is confirmed, suspected, or ruled out.