2026 ICD-10-CM Diagnosis Code P91.821Neonatal cerebral infarction, right side of brain

ICD-10-CM Codes›P00–P96›P90-P96›P91

ICD-10-CM P91.821
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P91.821 is a billable ICD-10-CM diagnosis code for neonatal cerebral infarction, right side of brain. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neonatal cerebral disorders.

Code Identity

ICD-10-CM Code
P91.821
Billable Status
Yes — Valid for Submission
Code Describes
Neonatal cerebral infarction, right side of brain
Short Description
Neonatal cerebral infarction, right side of brain
Same as the full description in the CMS dataset.
Parent Code
P91.82
Neonatal cerebral infarction

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP90-P96Other disorders originating in the perinatal period
CategoryP91Other disturbances of cerebral status of newborn
This CodeP91.821Neonatal cerebral infarction, right side of brain

Present on Admission (POA)Billing

P91.821 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PNL004
Neonatal cerebral disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Code History & ChangesHistory

Replacement P91.821 replaces the following previously assigned code(s):

  • P91.88 - Other specified disturbances of cerebral status of newborn
FY 2021AddedAdded to the ICD-10-CM code setEffective October 1, 2020.
FY 2022–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About P91.821Overview

Is P91.821 (Neonatal cerebral infarction) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report neonatal cerebral infarction, right side of brain on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is P91.821 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for neonatal cerebral infarction, right side of brain on inpatient claims.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.