G21.0
G21.0: Malignant neuroleptic syndrome
Billable / specific codeICD-10-CM
G21.0 is a billable, specific ICD-10-CM code for malignant neuroleptic syndrome. It is valid for submission on a claim.
Check G21.0 with the rest of the claim: free scrubberExcludes1: never code together
These conditions cannot occur together. Billing both on the same encounter is a denial.
- neuroleptic induced parkinsonism (G21.11)
Use additional code
Add a secondary code to capture the detail described below.
Other codes that can never be billed with G21.0
Their own Excludes1 notes name this code, so the conflict is not listed above.
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
G21.0 is named in 12 Medicare coverage policies: 12 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
- A56612Billing and Coding: CT of the Head
- A56619Billing and Coding: Nerve Conduction Studies and Electromyography
- A56756Billing and Coding: Home Health - Psychiatric Care
Alphabetic index entries that lead here
- Syndrome›malignant›neuroleptic
Code history
Unchanged in every release from FY2024 to FY2027.