ICD-10 Code G00.0 – Hemophilus meningitis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code G00.0 – Hemophilus meningitis
What it is
G00.0 identifies bacterial meningitis caused by Haemophilus influenzae. Use it when the record clearly states Hemophilus or Haemophilus meningitis, not just meningitis without an organism named.
Clinical signs
Typical findings include fever, headache, neck stiffness, altered mental status, and signs of meningeal irritation. Clinical features vary; refer to documentation and confirm the organism when recorded.
When to use this code
Use G00.0 when the provider documents meningitis due to Haemophilus species, including Haemophilus influenzae. It applies to confirmed or clearly documented Hemophilus meningitis in the current encounter. If the chart only says bacterial meningitis or meningitis NOS, check documentation before coding this specific organism.
Do not use for
Do not use G00.0 for viral, fungal, or unspecified meningitis. Do not assign it when Haemophilus is mentioned only as a possible cause or historical note.
Coding tip
Code the organism only when the provider links Haemophilus to the meningitis diagnosis in the record.