G21.11

G21.11: Neuroleptic induced parkinsonism

Billable / specific codeICD-10-CM

G21.11 is a billable, specific ICD-10-CM code for neuroleptic induced parkinsonism. It is valid for submission on a claim.

Check G21.11 with the rest of the claim: free scrubber

Excludes1: never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

malignant neuroleptic syndrome (G21.0)

Use additional code

Add a secondary code to capture the detail described below.

code for adverse effect, if applicable, to identify drug (T43.3X5, T43.4X5, T43.505, T43.595)

Excludes1 inherited from the categories above G21.11

A category’s note binds every code beneath it.

Written on G21: Secondary parkinsonism

Huntington's disease (G10)
neurocognitive disorder with Lewy bodies (G31.83)
Shy-Drager syndrome (G90.3)
syphilitic Parkinsonism (A52.19)

Other codes that can never be billed with G21.11

Their own Excludes1 notes name this code, so the conflict is not listed above.

G20.CParkinsonism, unspecified
G21.0Malignant neuroleptic syndrome

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

G21.11 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
A56621Billing and Coding: Swallowing Studies for Dysphagia

Alphabetic index entries that lead here

Parkinsonism›neuroleptic induced
Parkinsonism›due to›drugs NEC›neuroleptic
Parkinsonism›secondary›due to›drugs NEC›neuroleptic

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under G21.1

G21.19Other drug induced secondary parkinsonism