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ICD-10 Guide
ICD-10 CodesG31.89

G31.89

Billable

Other specified degenerative diseases of nervous system

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

Code Description

ICD-10 G31.89 is a billable code used to indicate a diagnosis of other specified degenerative diseases of nervous system.

Key Diagnostic Point:

G31.89 encompasses a variety of degenerative diseases of the nervous system that do not fall under more specific categories. This includes conditions such as frontotemporal dementia, progressive supranuclear palsy, and other atypical parkinsonian syndromes. These diseases are characterized by progressive cognitive decline, motor dysfunction, and behavioral changes. Alzheimer's disease, while a common form of dementia, is classified under a different code (G30). The clinical presentation of these conditions can vary widely, often leading to challenges in diagnosis and management. Patients may exhibit symptoms such as memory loss, difficulty with language, changes in personality, and impaired judgment. The assessment of cognitive decline typically involves a comprehensive evaluation, including neuropsychological testing, imaging studies, and clinical history. Accurate coding is essential for appropriate treatment planning and resource allocation in healthcare settings.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of conditions included under the code
  • Overlap with other neurological disorders
  • Need for detailed clinical documentation
  • Potential for misdiagnosis

Audit Risk Factors

  • Inadequate documentation of specific diagnosis
  • Failure to differentiate from similar conditions
  • Lack of supporting clinical evidence
  • Inconsistent coding across encounters

Specialty Focus

Medical Specialties

Neurology

Documentation Requirements

Detailed neurological examination findings, cognitive assessments, and imaging results.

Common Clinical Scenarios

Diagnosis of atypical dementia, management of progressive neurological symptoms.

Billing Considerations

Ensure clarity in documentation to differentiate between various degenerative diseases.

Geriatrics

Documentation Requirements

Comprehensive geriatric assessments, including functional status and cognitive evaluations.

Common Clinical Scenarios

Assessment of elderly patients with cognitive decline, management of comorbid conditions.

Billing Considerations

Focus on functional impairment and quality of life in documentation.

Coding Guidelines

Inclusion Criteria

Use G31.89 When
  • Follow the official ICD
  • CM coding guidelines, ensuring that the diagnosis is well
  • supported by clinical documentation
  • Include any relevant history of cognitive decline and associated symptoms

Exclusion Criteria

Do NOT use G31.89 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

96116CPT Code

Neuropsychological testing

Clinical Scenario

Used for cognitive assessment in patients suspected of having a degenerative disease.

Documentation Requirements

Document the rationale for testing and results.

Specialty Considerations

Neurologists should ensure comprehensive reports are available for accurate coding.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of degenerative diseases, improving the accuracy of diagnoses and treatment plans. G31.89 provides a necessary option for conditions that do not fit neatly into other categories.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of degenerative diseases, improving the accuracy of diagnoses and treatment plans. G31.89 provides a necessary option for conditions that do not fit neatly into other categories.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of degenerative diseases, improving the accuracy of diagnoses and treatment plans. G31.89 provides a necessary option for conditions that do not fit neatly into other categories.

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 conditions are included under G31.89?

G31.89 includes various unspecified degenerative diseases of the nervous system, such as frontotemporal dementia and progressive supranuclear palsy, but excludes Alzheimer's disease.