G21.0

Approximate Synonyms

• Neuroleptic malignant syndrome

Clinical Information

• A life-threatening condition that may be caused by certain drugs used to treat mental illness, nausea, or vomiting. Symptoms include high fever, sweating, unstable blood pressure, confusion, and stiffness.

• 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)

• A rare, life-threatening disorder that is caused by neuroleptic medications. It is characterized by fever, muscular cramps and rigidity, autonomic nervous system dysfunction, and changes in the mental status that may lead to coma.

Details

• G21.0 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

• The 2023 edition of ICD-10-CM G21.0 became effective on October 1, 2022.

• This is the American ICD-10-CM version of G21.0 – other international versions of ICD-10 G21.0 may differ.