ICD-10-CM 2027 diagnosis code
P91.61Mild hypoxic ischemic encephalopathy [HIE]
P91.61 is a valid, billable ICD-10-CM code for mild hypoxic ischemic encephalopathy [hie]. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About P91.61
P91.61 is the ICD-10-CM diagnosis code for mild hypoxic ischemic encephalopathy [HIE]. 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 P91.6 (hypoxic ischemic encephalopathy [HIE]), P91.61 is specifically for mild hypoxic ischemic encephalopathy [HIE]. Related codes cover unspecified (P91.60), moderate hypoxic ischemic encephalopathy [HIE] (P91.62) and severe hypoxic ischemic encephalopathy [HIE] (P91.63).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 794 (Neonate with Other Significant Problems, relative weight 1.4935), 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 has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Before ICD-10, this condition was coded in ICD-9-CM as 768.71 (mild hypoxic-ischemic encephalopathy).
Notes that apply from higher levels
Instructions written at a parent level also apply to P91.61.
Broader instructions also apply from Chapter 16: Certain conditions originating in the perinatal period.
Alphabetic index entries
2 entriesTerms in the official ICD-10-CM index that lead to P91.61.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period
ICD-9-CM equivalent
Converter →- 768.71Mild hypoxic-ischemic encephalopathyexact
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about P91.61
Is P91.61 billable?
- Yes. P91.61 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can P91.61 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict P91.61 as a principal diagnosis.
Is P91.61 a CC or MCC?
- P91.61 is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does P91.61 group to?
- P91.61 is used in the MS-DRG v44.0 logic for MS-DRG 794 (Neonate with Other Significant Problems). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.
What is the ICD-9 code for P91.61?
- The CMS General Equivalence Mappings map P91.61 to ICD-9-CM 768.71.