Secondary parkinsonism (G21)

• ICD-10 Index

  • Diseases of the nervous system (G00–G99)

    • Extrapyramidal and movement disorders (G20-G26)

      • Secondary parkinsonism (G21)

        • G21 - Secondary parkinsonism NON-BILLABLE CODE
        • G21.0 - Malignant neuroleptic syndrome BILLABLE CODE
        • G21.1 - Other drug-induced secondary parkinsonism NON-BILLABLE CODE
        • G21.11 - Neuroleptic induced parkinsonism BILLABLE CODE
        • G21.19 - Other drug induced secondary parkinsonism BILLABLE CODE
        • G21.2 - Secondary parkinsonism due to other external agents BILLABLE CODE
        • G21.3 - Postencephalitic parkinsonism BILLABLE CODE
        • G21.4 - Vascular parkinsonism BILLABLE CODE
        • G21.8 - Other secondary parkinsonism BILLABLE CODE
        • G21.9 - Secondary parkinsonism, unspecified BILLABLE CODE

Clinical Information for Secondary parkinsonism (G21)

Neuroleptic Malignant Syndrome - A potentially fatal syndrome associated primarily with the use of neuroleptic agents (see ANTIPSYCHOTIC AGENTS) which are in turn associated with dopaminergic receptor blockade (see RECEPTORS, DOPAMINE) in the BASAL GANGLIA and HYPOTHALAMUS, and sympathetic dysregulation. Clinical features include diffuse MUSCLE RIGIDITY; TREMOR; high FEVER; diaphoresis; labile blood pressure; cognitive dysfunction; and autonomic disturbances. Serum CPK level elevation and a leukocytosis may also be present. (From Adams et al., Principles of Neurology, 6th ed, p1199; Psychiatr Serv 1998 Sep;49(9):1163-72)

Instructional Notations

Type 1 Excludes Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

• dementia with Parkinsonism G31.83
• Huntington's disease G10
• Shy-Drager syndrome G90.3
• syphilitic Parkinsonism A52.19