G21.0
✓ Billable
Malignant neuroleptic syndrome
ICD-10-CM · FY2026 · Diseases of the Nervous System
Code
G21.0
System
ICD-10-CM
Billable
Yes — valid for submission
Effective
FY2026
Chapter
Diseases of the Nervous System
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code G21.0?
ICD-10-CM code G21.0 represents Malignant neuroleptic syndrome. It is a billable diagnosis code in the Diseases of the Nervous System chapter, effective October 1, 2025 – September 30, 2026.
Is G21.0 billable?
Yes. G21.0 is a valid billable ICD-10-CM code for insurance claims and clinical documentation.
What chapter is G21.0 in?
G21.0 belongs to the Diseases of the Nervous System chapter (G00–G99) of ICD-10-CM.
Related codes in the G21 category
G21
Secondary parkinsonism
Non-billable
G21.1
Other drug-induced secondary parkinsonism
Non-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
G21.11
Neuroleptic induced parkinsonism
Billable
Search all 98,186 ICD-10-CM codes instantly
Search ICDwise →