ICD-10-CM · Chapter 6 · G00–G99
G21.0
Malignant neuroleptic syndrome
Diseases of the nervous system
Quick facts
- Code
- G21.0
- Type
- Billable code
- ICD-10-CM chapter
- Chapter 6 — Diseases of the nervous system
- Category
- G21 — Secondary parkinsonism
- Specificity
- 4 characters
How coders use this code
ICD-10-CM G21.0 is a billable, fully specified code, so it can be reported directly on a claim to document a diagnosis of malignant neuroleptic syndrome. Coders assign it when the chart documentation supports this level of detail, always matching to the most specific code available and verifying against the chapter-specific guidelines published annually by NCHS/CMS.
Related codes in G21
- G21Secondary parkinsonism
- G21.1Other drug-induced secondary parkinsonism
- G21.11Neuroleptic induced parkinsonism
- G21.19Other drug induced secondary parkinsonism
- G21.2Secondary parkinsonism due to other external agents
- G21.3Postencephalitic parkinsonism
- G21.4Vascular parkinsonism
- G21.8Other secondary parkinsonism
- G21.9Secondary parkinsonism, unspecified
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