- 320 Bacterial meningitis
- 321 Meningitis due to other organisms
- 322 Meningitis of unspecified cause
- 323 Encephalitis myelitis and encephalomyelitis
- 324 Intracranial and intraspinal abscess
- 325 Phlebitis and thrombophlebitis of intracranial venous sinuses
- 326 Late effects of intracranial abscess or pyogenic infection
- 327 Organic sleep disorders
