2027 ICD-10-CM Diagnosis Code P91.2Neonatal cerebral leukomalacia
ICD-10-CM Codes›P00–P96›P90-P96›P91
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Risk Adjusts — HCC 202
- Not Chronic
P91.2 is a billable ICD-10-CM diagnosis code for neonatal cerebral leukomalacia. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93, 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 49 closely related codes. Coders also document this condition as cerebral leukomalacia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neonatal cerebral disorders.
For Medicare Advantage risk adjustment, P91.2 maps to CMS-HCC Category 202 (Coma, Brain Compression/Anoxic Damage) under the V28 model, adding a risk factor of about 0.543 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
P91.2 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.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Cerebral leukomalacia
- Neonatal cerebral leukomalacia
- Periventricular leukomalacia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to P91.2: its own notes plus those printed at 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
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Periventricular leukomalacia
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.
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Leukomalacia, cerebral, newborn P91.2
periventricular P91.2
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Brain Diseases
Your brain is the control center of your body. It controls your thoughts, memory, speech, and movement. It regulates the function of many organs. It's part of your nervous system, which also includes your spinal cord and peripheral nerves. The nervous system sends signals between your brain and the rest of the body.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert P91.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About P91.2Overview
What is the ICD-10 code for neonatal cerebral leukomalacia?
The ICD-10-CM code for neonatal cerebral leukomalacia is P91.2 (sometimes written as P912). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is P91.2 (Other disturbances of cerebral status of newborn) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report neonatal cerebral leukomalacia on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does P91.2 group to?
When neonatal cerebral leukomalacia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 91, 92, 93, with relative weights from 0.7783 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is P91.2 a CC or MCC?
CMS lists P91.2 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 49 closely related codes in its exclusion list.
What is the ICD-9 equivalent of P91.2?
Under the General Equivalence Mappings, neonatal cerebral leukomalacia converts to ICD-9-CM 779.7 (perivent leukomalacia). The mapping is approximate, so confirm the match fits the documentation.
What HCC is P91.2?
P91.2 (neonatal cerebral leukomalacia) maps to CMS-HCC Category 202 (Coma, Brain Compression/Anoxic Damage), commonly written as HCC 202, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It does not map to any RxHCC in the Part D prescription drug model.
Does P91.2 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, P91.2 adds a risk adjustment factor of about 0.543 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.097 to 0.721 depending on the payment segment). A more severe related category (HCC 63, HCC 397, and HCC 398) supersedes it when both are reported. See the full factor table on the HCC 202 category page.
