G03.1 ICD-10-CM Code: Chronic meningitis
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Diseases of the nervous system (G00-G99) / Inflammatory diseases of the central nervous system (G00-G09)
G03.1
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceChronic meningitis
Long-term inflammation of the membranes surrounding the brain and spinal cord that persists over an extended period.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
MappedHCC 4
Varies by metal level
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 G03.1 in this effective period.
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for G03.1 in this effective period.
Related Child Codes
Includes
Official- arachnoiditis NOS
- leptomeningitis NOS
- meningitis NOS
- pachymeningitis NOS
Excludes 1
Official- meningoencephalitis (G04.-)
- meningomyelitis (G04.-)
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for G03.1 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for G03.1 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for G03.1 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is G03.1 an HCC code?
No. G03.1 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- G03.1
- Description
- Chronic meningitis
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- 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
G03.1 is the ICD-10-CM diagnosis code for chronic meningitis. Long-term inflammation of the membranes surrounding the brain and spinal cord that persists over an extended period. G03.1 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).
G03.1 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Verify the duration of symptoms to confirm chronicity (typically lasting weeks to months).
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for G03.1 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Verify the duration of symptoms to confirm chronicity (typically lasting weeks to months)
- •Identify and code the underlying cause if documented (tuberculosis, fungal infection, etc.)