ICD-10-CM Book 2024 Edition

Chapters  /  Chapter 6  /  G20-G26  /  G21
G21 Secondary parkinsonism
Excludes1 dementia with Parkinsonism (G31.83)
Huntington's disease (G10)
Shy-Drager syndrome (G90.3)
syphilitic Parkinsonism (A52.19)
G21.0 Malignant neuroleptic syndrome
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T43.3X5, T43.4X5, T43.505, T43.595)
Excludes1 neuroleptic induced parkinsonism (G21.11)
G21.1 Other drug-induced secondary parkinsonism
G21.11 Neuroleptic induced parkinsonism
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T43.3X5, T43.4X5, T43.505, T43.595)
Excludes1 malignant neuroleptic syndrome (G21.0)
G21.19 Other drug induced secondary parkinsonism
Other medication-induced parkinsonism
UseAdditionalCode code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)
G21.2 Secondary parkinsonism due to other external agents
CodeFirst (T51-T65) to identify external agent
G21.3 Postencephalitic parkinsonism
G21.4 Vascular parkinsonism
G21.8 Other secondary parkinsonism
G21.9 Secondary parkinsonism, unspecified