G89-G99
Medium Complexity
Other disorders of the nervous system
Primary Specialty: Neurology
Last Updated: 2025-09-09
ICD-10 Codes (131)
131 billable0 category headers
G90Billable
G90.0Billable
G90.01Billable
G90.09Billable
G90.1Billable
G90.2Billable
G90.3Billable
G90.4Billable
G90.5Billable
G90.50Billable
G90.51Billable
G90.511Billable
G90.512Billable
G90.513Billable
G90.519Billable
G90.52Billable
G90.521Billable
G90.522Billable
G90.523Billable
G90.529Billable
G90.59Billable
G90.8Billable
G90.81Billable
G90.89Billable
G90.9Billable
G91Billable
G91.0Billable
G91.1Billable
G91.2Billable
G91.3Billable
G91.4Billable
G91.8Billable
G91.9Billable
G92Billable
G92.0Billable
G92.00Billable
G92.01Billable
G92.02Billable
G92.03Billable
G92.04Billable
G92.05Billable
G92.8Billable
G92.9Billable
G93Billable
G93.0Billable
G93.1Billable
G93.2Billable
G93.3Billable
G93.31Billable
G93.32Billable
G93.39Billable
G93.4Billable
G93.40Billable
G93.41Billable
G93.42Billable
G93.43Billable
G93.44Billable
G93.45Billable
G93.49Billable
G93.5Billable
G93.6Billable
G93.7Billable
G93.8Billable
G93.81Billable
G93.82Billable
G93.89Billable
G93.9Billable
G94Billable
G95Billable
G95.0Billable
G95.1Billable
G95.11Billable
G95.19Billable
G95.2Billable
G95.20Billable
G95.29Billable
G95.8Billable
G95.81Billable
G95.89Billable
G95.9Billable
G96Billable
G96.0Billable
G96.00Billable
G96.01Billable
G96.02Billable
G96.08Billable
G96.09Billable
G96.1Billable
G96.11Billable
G96.12Billable
G96.19Billable
G96.191Billable
G96.198Billable
G96.8Billable
G96.81Billable
G96.810Billable
G96.811Billable
G96.819Billable
G96.89Billable
G96.9Billable
G97Billable
G97.0Billable
G97.1Billable
G97.2Billable
G97.3Billable
G97.31Billable
G97.32Billable
G97.4Billable
G97.41Billable
G97.48Billable
G97.49Billable
G97.5Billable
G97.51Billable
G97.52Billable
G97.6Billable
G97.61Billable
G97.62Billable
G97.63Billable
G97.64Billable
G97.8Billable
G97.81Billable
G97.82Billable
G97.83Billable
G97.84Billable
G98Billable
G98.0Billable
G98.8Billable
G99Billable
G99.0Billable
G99.2Billable
G99.8Billable
Updates & Changes
FY 2026 Updates
Current Year
Deleted Codes
No codes deleted in this range for FY 2026
No significant changes for FY 2026
This range maintains stability with current coding practices
Historical Changes
- •FY 2025: Routine maintenance updates with minor terminology clarifications
- •FY 2024: Enhanced specificity requirements for certain code ranges
- •FY 2023: Updated documentation guidelines for improved clarity
Upcoming Changes
- •Proposed updates pending review by Coordination and Maintenance Committee
- •Under consideration: Enhanced digital health integration codes
Implementation Guidance
- •Review all FY 2026 updates for G89-G99 codes before implementation
- •Always verify the most current codes in the ICD-10-CM manual
- •Ensure clinical documentation supports the selected diagnosis codes
- +3 more guidance items...
Range Overview
high priority
The ICD-10 code range G89-G99 covers a variety of disorders related to the nervous system. These codes are used to classify conditions such as pain, other disorders of the nervous system, and certain disorders of the meninges. The codes are used to provide a more specific diagnosis, which can help in determining the appropriate treatment plan for the patient.
Key Usage Points:
- •G89 codes are used for different types of pain, including chronic pain and pain not elsewhere classified.
- •G90 codes cover disorders of the autonomic nervous system, like complex regional pain syndrome and dysautonomia.
- •G91-G93 codes are used for hydrocephalus and other disorders of the brain.
- •G94 codes are for disorders of meninges, not elsewhere classified.
- •G96 codes cover other disorders of central nervous system, and G97 for postprocedural disorders of nervous system, not elsewhere classified.
- •G98-G99 codes are for other disorders of the nervous system.
Coding Guidelines
When to Use:
- ✓When the patient is diagnosed with chronic pain syndromes.
- ✓When the patient has a disorder of the autonomic nervous system.
- ✓When the patient has a postprocedural disorder of the nervous system.
- ✓When the patient is diagnosed with hydrocephalus.
- ✓When the patient has a disorder of the meninges.
When NOT to Use:
- ✗When the patient's condition is better described by a different ICD-10 code.
- ✗When the patient's condition is not a disorder of the nervous system.
- ✗When the patient's condition is a mental or behavioral disorder.
- ✗When the patient's condition is a disease of the eye or adnexa.
- ✗When the patient's condition is a disease of the ear or mastoid process.
Code Exclusions
Always verify the exclusions in the ICD-10-CM official guidelines and coding manual.
Documentation Requirements
Proper documentation for codes G89-G99 should include a clear and specific diagnosis, the location of the disorder, the severity of the condition, and any associated complications or comorbidities. The documentation should also include the patient's medical history and any relevant clinical findings.
Clinical Information:
- •Specific diagnosis
- •Location of the disorder
- •Severity of the condition
- •Associated complications or comorbidities
- •Patient's medical history
Supporting Evidence:
- •Clinical findings
- •Laboratory test results
- •Imaging results
- •Notes from physical examination
Good Documentation Example:
Patient diagnosed with chronic pain syndrome due to spinal cord injury. Pain is severe and is located in the lower back. Patient has a history of hypertension.
Poor Documentation Example:
Patient has back pain.
Common Documentation Errors:
- âš Not specifying the location of the disorder
- âš Not indicating the severity of the condition
- âš Not documenting associated complications or comorbidities
- âš Not including the patient's medical history
Range Statistics
Total Codes
131
Billable
Complexity:
Medium
Primary Use:Clinical Documentation
Chapter:6
Coding Complexity
Medium
Complexity Rating
The complexity rating for the G89-G99 code range is medium due to the need to understand the specific diagnosis, determine the location of the disorder, assess the severity of the condition, identify any associated complications or comorbidities, and apply the correct code based on the documentation.
Key Factors:
- â–¸Understanding the specific diagnosis
- â–¸Determining the location of the disorder
- â–¸Assessing the severity of the condition
- â–¸Identifying any associated complications or comorbidities
- â–¸Applying the correct code based on the documentation
Specialty Focus
The G89-G99 code range is particularly relevant for neurologists, pain management specialists, and neurosurgeons. These codes are used to document a wide variety of neurological conditions and disorders.
Primary Specialties:
Neurology
40%
Pain Management
30%
Neurosurgery
30%
Clinical Scenarios:
- • A patient with complex regional pain syndrome.
- • A patient with post-laminectomy syndrome.
- • A patient with hydrocephalus.
- • A patient with a disorder of the meninges.
- • A patient with a postprocedural disorder of the nervous system.
Resources & References
There are many resources available for understanding and applying the G89-G99 code range, including the ICD-10-CM official guidelines, coding manuals, clinical reference books, and educational materials.
Official Guidelines:
- ICD-10-CM Official Guidelines for Coding and Reporting
- American Health Information Management Association (AHIMA) Coding Manual
- American Medical Association (AMA) Coding Manual
Clinical References:
- Harrison's Principles of Internal Medicine
- The Merck Manual of Diagnosis and Therapy
Educational Materials:
- ICD-10-CM Coding Workbook
- ICD-10-CM Online Training Course
Frequently Asked Questions
Can G89-G99 codes be used for mental or behavioural disorders?
No, mental and behavioural disorders are coded in the F00-F99 range.
What information is needed to code accurately in the G89-G99 range?
You need a specific diagnosis, the location of the disorder, the severity of the condition, and any associated complications or comorbidities.