G03.9 Meningitis, unspecified

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Applicable to

• Arachnoiditis (spinal) NOS

Applies from G03 Meningitis due to other and unspecified causes

Includes

• arachnoiditis NOS
• leptomeningitis NOS
• meningitis NOS
• pachymeningitis NOS

Excludes1 (never code together)

• meningoencephalitis (G04.-)
• meningomyelitis (G04.-)

MS-DRG index

Defines the logic of DRG(s) 097-099 in MDC 01.

Approximate ICD-9-CM (GEMs)

• 322.9 Meningitis, unspecified

Diagnosis Index entries for G03.9

• Meningitis (basal) (basic) (brain) (cerebral) (cervical) (congestive) (diffuse) (hemorrhagic) (infantile) (membranous) (metastatic) (nonspecific) (pontine) (progressive) (simple) (spinal) (subacute) (sympathetic) (toxic)

Nearby codes

• G03 Meningitis due to other and unspecified causes
• G03.0 Nonpyogenic meningitis
• G03.1 Chronic meningitis
• G03.2 Benign recurrent meningitis [Mollaret]
• G03.8 Meningitis due to other specified causes
• G03.9 Meningitis, unspecified (this code)