Extrapyramidal and movement disorders (G20-G26)

ICD-10 codes G20-G26 are specifically used to classify extrapyramidal and movement disorders. These codes identify various conditions affecting motor control, including Parkinson's disease, dystonia, tremors, chorea, and drug-induced movement disorders.

This range includes the primary Parkinson's disease codes (G20 series), capturing distinctions like Parkinson’s without dyskinesia (G20.A1), with dyskinesia (G20.B), and unspecified parkinsonism (G20.C). It also covers secondary parkinsonism due to drugs or toxins (G21), and degenerative basal ganglia diseases such as Hallervorden-Spatz disease (G23.0) and progressive supranuclear ophthalmoplegia (G23.1). The dystonia codes (G24) identify involuntary muscle contractions with genetic and drug-induced causes. Other movement disorders (G25) include essential tremor (G25.0), myoclonus (G25.3), and chorea (G25.5), along with drug-induced tics and akathisia. The codes also present classifications for restless legs syndrome (G25.81) and stiff-man syndrome (G25.82). This structured coding aids in precise documentation and differentiation of complex movement disorders encountered in clinical practice.