Table 1

ICD-10 codes used to define the neuroinflammatory events of interest and specific subgroups of diseases for the analyses

Neuroinflammatory eventICD codeSubgroup
Demyelinating diseases of the central nervous systemG35 with all sub-codes, G36.0, G36.8, G36.9, G37.1, G37.3, G37.5, G37.8, G37.91: Demyelinating diseases of the central nervous system and optic neuritis (subsequently named: ‘demyelinating diseases’)
Optic neuritisH46
Retrobulbar neuritis in diseases classified elsewhereH48.1
Other encephalitis, myelitis and encephalomyelitis and unspecifiedG04.8, G04.9
Multiple sclerosis (MS)G35 with all subcodes2: MS
Inflammatory polyneuropathiesG61.0, G61.8, G61.93: Inflammatory polyneuropathies (subsequently named: ‘polyneuropathies’)
  • ICD-10, International Classification of Diseases 10 revision.