2027 ICD-10-CM Diagnosis Code P91.822Neonatal cerebral infarction, left side of brain
ICD-10-CM Codes›P00–P96›P90-P96›P91
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Risk Adjusts — HCC 249
- POA Exempt
- Not Chronic
P91.822 is a billable ICD-10-CM diagnosis code for neonatal cerebral infarction, left side of brain. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 4 closely related codes. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neonatal cerebral disorders.
For Medicare Advantage risk adjustment, P91.822 maps to CMS-HCC Category 249 (Ischemic or Unspecified Stroke) under the V28 model, adding a risk factor of about 0.239 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Present on Admission (POA)Billing
P91.822 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Other disorders originating in the perinatal period (P90-P96).
Medicare Risk Adjustment (HCC)Billing
P91.822 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to P91.822: its own notes plus those printed at P91.82 and Chapter 16. A note printed at a category, block or chapter applies to every code under it.
Includes
Further defines, or gives examples of, the content of the category.
- conditions that have their origin in the fetal or perinatal period (before birth through the first 28 days after birth) even if morbidity occurs later
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- intracranial hemorrhage of newborn (P52.-)
Notes
General instructions on how these codes are used.
- Codes from this chapter are for use on newborn records only, never on maternal records
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name P91.822, its category, or a range that includes it.
Excludes1 2
These codes carry an Excludes1 note naming P91.822: they are not reported together with it, unless the two conditions are unrelated.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Code History & ChangesHistory
Replacement P91.822 replaces the following previously assigned code(s):
- P91.88 - Other specified disturbances of cerebral status of newborn
Questions About P91.822Overview
What is the ICD-10 code for neonatal cerebral infarction, left side of brain?
The ICD-10-CM code for neonatal cerebral infarction, left side of brain is P91.822 (sometimes written as P91822). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is P91.822 (Neonatal cerebral infarction) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report neonatal cerebral infarction, left side of brain on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does P91.822 group to?
When neonatal cerebral infarction, left side of brain is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, with relative weights from 4.1073 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is P91.822 a CC or MCC?
CMS lists P91.822 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 4 closely related codes in its exclusion list.
Is P91.822 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, left side of brain on inpatient claims. The code appears in the Other disorders originating in the perinatal period (P90-P96) range of the CMS exempt list.
What HCC is P91.822?
P91.822 (neonatal cerebral infarction, left side of brain) maps to CMS-HCC Category 249 (Ischemic or Unspecified Stroke), commonly written as HCC 249, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 100 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. It does not map to any RxHCC in the Part D prescription drug model.
Does P91.822 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, P91.822 adds a risk adjustment factor of about 0.239 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.081 to 0.377 depending on the payment segment). A more severe related category (HCC 248) supersedes it when both are reported. See the full factor table on the HCC 249 category page.
