Diseases of the nervous system
This chapter covers ICD-10-CM codes in the range G00-G99 for diseases of the nervous system. Includes diseases of the central and peripheral nervous system such as meningitis, Alzheimer's, Parkinson's, and epilepsy.
Chapter Overview
Key Statistics
- •Contains 11 categories and 68 total codes
- •Includes 68 billable codes and 0 non-billable codes
- •Chapter range: G00-G99
Clinical Relevance
Essential for neurological conditions including dementia, epilepsy, and movement disorders. Critical for neurology, neurosurgery, and geriatric medicine.
Documentation Requirements
Requires neurological examination findings, imaging results, and functional status assessment. Seizure types and control status must be documented.
Special Considerations
Progressive conditions require staging and severity documentation. Drug-resistant epilepsy has specific coding requirements.
Categories in this Chapter
Inflammatory diseases of the central nervous system
Systemic atrophies primarily affecting the central nervous system
Extrapyramidal and movement disorders
Other degenerative diseases of the nervous system
Demyelinating diseases of the central nervous system
Episodic and paroxysmal disorders
Nerve, nerve root and plexus disorders
Polyneuropathies and other disorders of the peripheral nervous system
Diseases of myoneural junction and muscle
Cerebral palsy and other paralytic syndromes
Other disorders of the nervous system
Chapter-Specific Coding Guidelines
General Guidelines for Diseases of the nervous system:
- Follow standard ICD-10-CM coding principles for diseases of the nervous system
- Document the most specific diagnosis supported by the medical record
- Use additional codes for manifestations, complications, or associated conditions
- Ensure proper sequencing based on the reason for the encounter
Documentation Requirements:
- •Specific condition or disease process
- •Acute versus chronic status when applicable
- •Severity or stage when documented
- •Associated symptoms or complications
- •Treatment response and current status
Sequencing Rules:
- Principal diagnosis should reflect the main reason for the encounter
- Sequence complications according to treatment focus
- Use appropriate combination codes when available
- Follow chapter-specific sequencing guidelines
When to Use:
- ✓For conditions classified in the G00-G99 range
- ✓When the condition is the primary focus of care
- ✓During active treatment or monitoring
- ✓For documented complications of the condition
When NOT to Use:
- ✗For personal history without current manifestations
- ✗During screening encounters without findings
- ✗For conditions better classified elsewhere
- ✗When condition is ruled out or suspected only
Special Considerations:
- ⚠Review chapter-specific coding guidelines
- ⚠Consider combination codes before multiple codes
- ⚠Document functional impact when relevant
- ⚠Use external cause codes when applicable
Version Updates
The 2025 ICD-10-CM updates include refinements to diseases of the nervous system coding for improved specificity and clinical relevance.
Recent Updates:
Enhanced Diseases of the nervous system Specificity
Updated codes within G00-G99 for improved clinical documentation
Impact: Better alignment with clinical practice and quality reporting
Implementation Guidance:
- •Review all diseases of the nervous system coding practices
- •Update documentation templates as needed
- •Train coding staff on any new requirements
- •Implement quality checks for accuracy
Upcoming Changes:
- →Potential enhancements to diseases of the nervous system codes in future updates
- →Continued alignment with clinical practice evolution
Related Resources
Key resources for diseases of the nervous system coding and clinical documentation.
Official Documentation:
Related Chapters:
Tools and References:
Frequently Asked Questions
What are the key considerations when coding diseases of the nervous system?
Focus on specific diagnosis documentation, proper sequencing, and use of additional codes for complications or manifestations related to diseases of the nervous system.
How do I determine the most appropriate code within this chapter?
Review the medical documentation for the most specific diagnosis, check for combination codes, and follow the ICD-10-CM guidelines for this chapter.
When should I use additional codes?
Use additional codes for manifestations, complications, external causes, or other conditions that affect patient care during the encounter.