ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
ICD-10 CodesG21.11

G21.11

Billable

Neuroleptic induced parkinsonism

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 G21.11 is a billable code used to indicate a diagnosis of neuroleptic induced parkinsonism.

Key Diagnostic Point:

Neuroleptic induced parkinsonism is a type of drug-induced movement disorder characterized by symptoms similar to those of Parkinson's disease, resulting from the use of neuroleptic medications, which are primarily used to treat psychiatric disorders. Patients may present with bradykinesia, rigidity, tremors, and postural instability. The condition arises due to the blockade of dopamine receptors in the nigrostriatal pathway, leading to an imbalance in the dopaminergic and cholinergic systems. Symptoms can develop shortly after the initiation of neuroleptic therapy or after dosage increases. While the condition is often reversible upon discontinuation or reduction of the neuroleptic medication, some patients may experience persistent symptoms. It is crucial for healthcare providers to differentiate neuroleptic induced parkinsonism from idiopathic Parkinson's disease and other extrapyramidal disorders to ensure appropriate management and treatment. The diagnosis is primarily clinical, supported by patient history and response to medication adjustments.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Differentiation from idiopathic Parkinson's disease
  • Need for detailed medication history
  • Potential for overlapping symptoms with other movement disorders
  • Variability in patient response to neuroleptic medications

Audit Risk Factors

  • Inadequate documentation of medication history
  • Failure to note the timeline of symptom onset
  • Misdiagnosis as idiopathic Parkinson's disease
  • Lack of follow-up documentation on symptom resolution

Specialty Focus

Medical Specialties

Psychiatry

Documentation Requirements

Detailed records of medication prescribed, dosages, and patient responses.

Common Clinical Scenarios

Patients presenting with new-onset movement disorders after starting or increasing neuroleptic medications.

Billing Considerations

Consideration of alternative treatments and monitoring for side effects.

Neurology

Documentation Requirements

Comprehensive neurological assessments and differentiation from other movement disorders.

Common Clinical Scenarios

Patients with a history of neuroleptic use presenting with parkinsonian symptoms.

Billing Considerations

Need for thorough evaluation to rule out other causes of parkinsonism.

Coding Guidelines

Inclusion Criteria

Use G21.11 When
  • According to ICD
  • 10 guidelines, G21
  • 11 should be used when parkinsonism is specifically linked to neuroleptic medication use
  • Documentation must clearly indicate the relationship between medication and symptom onset

Exclusion Criteria

Do NOT use G21.11 When
  • Exclusion criteria include parkinsonism due to other causes

Related ICD-10 Codes

Related CPT Codes

99213CPT Code

Established patient office visit, Level 3

Clinical Scenario

Used for follow-up visits to assess symptoms and medication adjustments.

Documentation Requirements

Document patient history, medication changes, and symptom assessment.

Specialty Considerations

Psychiatric and neurological evaluations may require additional documentation.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of neuroleptic induced parkinsonism, facilitating better tracking of drug-induced movement disorders and improving patient management.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of neuroleptic induced parkinsonism, facilitating better tracking of drug-induced movement disorders and improving patient management.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of neuroleptic induced parkinsonism, facilitating better tracking of drug-induced movement disorders and improving patient management.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What are the primary symptoms of neuroleptic induced parkinsonism?

The primary symptoms include bradykinesia, rigidity, tremors, and postural instability, which are similar to those seen in idiopathic Parkinson's disease.

How can neuroleptic induced parkinsonism be differentiated from idiopathic Parkinson's disease?

Differentiation is based on the patient's medication history, the timing of symptom onset in relation to neuroleptic use, and the response to medication adjustments.