2026 ICD-10-CM Diagnosis Code G21.11Neuroleptic induced parkinsonism

ICD-10-CM Codes›G00–G99›G20-G26›G21

ICD-10-CM G21.11
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

G21.11 is a billable ICD-10-CM diagnosis code for neuroleptic induced parkinsonism. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as neuroleptic-induced parkinsonism. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Drug induced or toxic related condition and Other nervous system disorders (often hereditary or degenerative).

Code Identity

ICD-10-CM Code
G21.11
Billable Status
Yes — Valid for Submission
Code Describes
Neuroleptic induced parkinsonism
Short Description
Neuroleptic induced parkinsonism
Same as the full description in the CMS dataset.
Parent Code
G21.1
Other drug-induced secondary parkinsonism

Code Classification

ChapterG00–G99Diseases of the nervous system
SectionG20-G26Extrapyramidal and movement disorders
CategoryG21Secondary parkinsonism
This CodeG21.11Neuroleptic induced parkinsonism

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Neuroleptic-induced parkinsonism
  • Parkinsonism caused by drug

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Use Additional Code

Type 1 Excludes

  • malignant neuroleptic syndrome G21.0

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Parkinsonism(idiopathic) (primary)
      • due to
        • drugs NEC
          • neuroleptic
    • Parkinsonism(idiopathic) (primary)
      • neuroleptic induced
    • Parkinsonism(idiopathic) (primary)
      • secondary
        • due to
          • drugs NEC
            • neuroleptic

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR INJ030
Drug induced or toxic related condition
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR NVS006
Other nervous system disorders (often hereditary or degenerative)
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Drug Reactions

Most of the time, medicines make our lives better. They reduce aches and pains, fight infections, and control problems such as high blood pressure or diabetes. But medicines can also cause unwanted reactions, such as drug interactions, side effects, and allergies.

The full article covers:

  • What is a drug interaction?
  • What are side effects?
  • What are drug allergies?
  • How can I stay safe when taking medicines?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert G21.11 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
332.1 Secondary parkinsonism
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About G21.11Overview

Is G21.11 (Other drug-induced secondary parkinsonism) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report neuroleptic induced parkinsonism on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of G21.11?

Under the General Equivalence Mappings, neuroleptic induced parkinsonism converts to ICD-9-CM 332.1 (secondary parkinsonism). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.