P91.811Neonatal encephalopathy in diseases classified elsewhere

P91.811 is the ICD-10-CM diagnosis code for neonatal encephalopathy in diseases classified elsewhere. It belongs to category P91 (other disturbances of cerebral status of newborn), block P90-P96 (other disorders originating in the perinatal period) and chapter 16 (certain conditions originating in the perinatal period). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within P91.81 (neonatal encephalopathy), P91.811 is specifically for neonatal encephalopathy in diseases classified elsewhere. Related codes cover unspecified (P91.819).

Code first underlying condition, if known, such as: congenital cirrhosis (of liver) (P78.81), intracranial nontraumatic hemorrhage of newborn (P52.-) and kernicterus (P57.-).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 791 (Prematurity with Major Problems, relative weight 4.1075) and DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It was added in FY2018, effective October 1, 2017.

Before ICD-10, this condition was coded in ICD-9-CM as 779.1 (other and unspecified cerebral irritability in newborn).