ICD-10-CM > P00-P96 > P90-P96 > P91 > P91.6 P91.6 Hypoxic ischemic encephalopathy [HIE] Non-Billable/Non-Specific Type 1 Excludes Neonatal cerebral depression (P91.4)Neonatal cerebral irritability (P91.3)Neonatal coma (P91.5) Codes P91.60Hypoxic ischemic encephalopathy [HIE], unspecifiedP91.61Mild hypoxic ischemic encephalopathy [HIE]P91.62Moderate hypoxic ischemic encephalopathy [HIE]P91.63Severe hypoxic ischemic encephalopathy [HIE]