G04.39 ICD-10-CM Code: Other acute necrotizing hemorrhagic encephalopathy
G04.39 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC coding software
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FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Inflammatory diseases of the central nervous system (G00-G09)
G04.39
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceOther acute necrotizing hemorrhagic encephalopathy
A severe brain inflammation with bleeding and tissue death caused by factors other than vaccination or unspecified causes.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
MappedHCC 003
Code-level coefficient reference
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
OfficialICD-10-CM does not list inclusion terms for G04.39 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for G04.39 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for G04.39 in this effective period.
Excludes 1
Official- acute disseminated encephalitis and encephalomyelitis (G04.0-)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for G04.39 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for G04.39 in this effective period.
Code Also
Official- underlying etiology, if applicable
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is G04.39 an HCC code?
G04.39 is not in the CMS-HCC V28 or V24 community payment model. G04.39 also appears in the HHS-HCC commercial risk model (HCC 003 (HHS-HCC 003 adult, RAF varies by metal level)), which is a commercial market model rather than a Medicare Advantage payment mapping.
- Code
- G04.39
- Description
- Other acute necrotizing hemorrhagic encephalopathy
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
G04.39 is the ICD-10-CM diagnosis code for other acute necrotizing hemorrhagic encephalopathy. A severe brain inflammation with bleeding and tissue death caused by factors other than vaccination or unspecified causes. G04.39 sits in the ICD-10-CM chapter for diseases of the nervous system (g00-g99), within the section covering inflammatory diseases of the central nervous system (g00-g09).
G04.39 has no mapping under the CMS-HCC V28 or V24 community payment models. G04.39 also appears in the HHS-HCC commercial risk model (HCC 003 (HHS-HCC 003 adult, RAF varies by metal level)), which is a commercial market model rather than a Medicare Advantage payment mapping. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.
Identify and document the specific cause (infection, autoimmune, toxic, etc.) in the medical record.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for G04.39 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
Code Also
- underlying etiology, if applicable