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ICD-10 Guide
ICD-10 CodesG31.83

G31.83

Billable

Neurocognitive disorder with Lewy bodies

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

Code Description

ICD-10 G31.83 is a billable code used to indicate a diagnosis of neurocognitive disorder with lewy bodies.

Key Diagnostic Point:

Neurocognitive disorder with Lewy bodies is characterized by a progressive decline in cognitive function due to the presence of Lewy bodies in the brain, which are abnormal aggregates of protein that disrupt normal neuronal function. Patients typically present with fluctuating cognition, recurrent visual hallucinations, and parkinsonism, which includes symptoms such as rigidity, bradykinesia, and postural instability. This disorder often overlaps with Alzheimer's disease and other neurodegenerative conditions, making differential diagnosis critical. Cognitive decline assessment may involve neuropsychological testing, imaging studies, and clinical evaluations to determine the extent of cognitive impairment and to rule out other causes. The presence of Lewy bodies can be confirmed post-mortem, but clinical diagnosis relies on the identification of characteristic symptoms and patterns of cognitive decline. The management of this disorder often includes cholinesterase inhibitors and atypical antipsychotics, although treatment must be approached cautiously due to potential adverse effects.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Overlap with other neurodegenerative disorders such as Alzheimer's disease.
  • Variability in symptom presentation and progression.
  • Need for comprehensive cognitive assessments.
  • Potential for misdiagnosis due to similar symptoms with other conditions.

Audit Risk Factors

  • Inadequate documentation of cognitive assessments.
  • Failure to document the presence of visual hallucinations.
  • Misclassification of the disorder as Alzheimer's disease.
  • Lack of detailed clinical notes regarding symptom fluctuation.

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Detailed clinical notes on cognitive assessments, neurological examinations, and symptomatology.

Common Clinical Scenarios

Diagnosis and management of patients presenting with cognitive decline, visual hallucinations, and parkinsonism.

Billing Considerations

Neurologists must ensure comprehensive documentation to support the diagnosis and differentiate from other dementias.

Psychiatry

Documentation Requirements

Thorough psychiatric evaluations, including mental status examinations and history of hallucinations.

Common Clinical Scenarios

Management of behavioral symptoms associated with Lewy body dementia, including hallucinations and mood disturbances.

Billing Considerations

Psychiatrists should document the impact of cognitive decline on mental health and any treatment adjustments.

Coding Guidelines

Inclusion Criteria

Use G31.83 When
  • According to ICD
  • 10 coding guidelines, G31
  • 83 should be used when there is clear documentation of neurocognitive disorder with Lewy bodies
  • It is important to include details about the patient's cognitive assessments and any associated symptoms

Exclusion Criteria

Do NOT use G31.83 When
  • Exclusion criteria include other specified neurocognitive disorders that do not meet the criteria for Lewy bodies

Related ICD-10 Codes

Related CPT Codes

96116CPT Code

Neuropsychological testing

Clinical Scenario

Used to assess cognitive function in patients suspected of having Lewy body dementia.

Documentation Requirements

Detailed report of cognitive assessments and findings.

Specialty Considerations

Documentation should clearly link cognitive deficits to the diagnosis of Lewy body dementia.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of neurocognitive disorders, including Lewy body dementia, which enhances the ability to track and manage these conditions more effectively in clinical practice.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of neurocognitive disorders, including Lewy body dementia, which enhances the ability to track and manage these conditions more effectively in clinical practice.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of neurocognitive disorders, including Lewy body dementia, which enhances the ability to track and manage these conditions more effectively in clinical practice.

Resources

Clinical References

  • •
    American Academy of Neurology - Lewy Body Dementia

Coding & Billing References

  • •
    American Academy of Neurology - Lewy Body Dementia

Frequently Asked Questions

What are the key symptoms of neurocognitive disorder with Lewy bodies?

Key symptoms include fluctuating cognition, visual hallucinations, and parkinsonism. Patients may experience variations in attention and alertness, along with motor symptoms typical of Parkinson's disease.