ICD-10-CM · FY 2026 APRIL UPDATE
G21
Secondary parkinsonism
Diagnosis reference
Nonbillable categoryThis entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.
Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification
Related entries
Up to 30 descendants in this category
| CODE | DESCRIPTION | TYPE |
|---|---|---|
| G21.0 | Malignant neuroleptic syndrome | Billable |
| G21.1 | Other drug-induced secondary parkinsonism | Category |
| G21.11 | Neuroleptic induced parkinsonism | Billable |
| G21.19 | Other drug induced secondary parkinsonism | Billable |
| G21.2 | Secondary parkinsonism due to other external agents | Billable |
| G21.3 | Postencephalitic parkinsonism | Billable |
| G21.4 | Vascular parkinsonism | Billable |
| G21.8 | Other secondary parkinsonism | Billable |
| G21.9 | Secondary parkinsonism, unspecified | Billable |
Use the complete reference
This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.
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