ICD-10 G01
Billable / Specific MCCMeningitis in bacterial diseases classified elsewhere
About ICD-10-CM G01
ICD-10-CM code G01 represents Meningitis in bacterial diseases classified elsewhere. This is a billable/specific code in the Nervous System chapter (block G01). The 2026 edition of ICD-10-CM G01 became effective on October 1, 2025.
Coding Tips for G01
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
G01 is designated MCC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-MCC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag MCC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Type 1 Excludes
Pure excludes, these codes can never be coded together with G01. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- meningitis (in):
- gonococcal (A54.81)
- leptospirosis (A27.81)
- listeriosis (A32.11)
- Lyme disease (A69.21)
- meningococcal (A39.0)
- neurosyphilis (A52.13)
- tuberculosis (A17.0)
- meningoencephalitis and meningomyelitis in bacterial diseases classified elsewhere (G05)
Coding Notes
Code First
- underlying disease
Inpatient DRG Impact, MCC
codes Meningitis in bacterial diseases classified elsewhere. As a Major Complication/Comorbidity (MCC), this can shift the DRG assignment to a higher-weighted category, substantial reimbursement impact.
Medicare LCD Coverage for G01
Local Coverage Determinations (LCDs) from CMS MACs that list G01 as a covered diagnosis.
Showing top 10 of 34 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing G01.
3 Medicare
CPT Codes Commonly Billed with G01
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert G01 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| G01 | 3207 | 00000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To G01
Other codes in section G00-G09 (Inflammatory diseases of the central nervous system).
ICD-10 G01, Billing FAQ
Is ICD-10 code G01 billable? +
Yes, G01 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What codes are Type 1 Excludes for G01? +
Type 1 Excludes (never code together with G01): meningitis (in):; gonococcal (A54.81); leptospirosis (A27.81)
Is G01 a CC or MCC for inpatient DRG? +
Yes, this code is designated as MCC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What ICD-9 codes does G01 map to? +
Per CMS GEMs, G01 maps to ICD-9 codes: 3207. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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