G21.0

Billable

Malignant neuroleptic syndrome

G21.0 is the ICD-10-CM code for Malignant neuroleptic syndrome. It is a billable, specific code valid for reimbursement.

Status
Billable
Chapter
G00-G99
Parent
G21
Edition
FY2026

G00-G99 Diseases of the nervous system

Excludes1 — not coded here

  • neuroleptic induced parkinsonism (G21.11)

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Frequently asked questions

What is ICD-10 code G21.0?
G21.0 is the ICD-10-CM code for "Malignant neuroleptic syndrome". It falls under G00-G99 Diseases of the nervous system.
Is G21.0 a billable code?
Yes — G21.0 is a billable, specific ICD-10-CM code valid for reimbursement.
What is excluded from G21.0?
Excludes1 (not coded here): neuroleptic induced parkinsonism (G21.11).

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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