Is G99 a billable code?
No. G99 is a header code that groups 3 more specific codes. Use one of the billable codes listed on this page instead.
ICD-10-CM FY2027 diagnosis code
G99: Other disorders of nervous system in diseases classified elsewhere
Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027
G99 groups related diagnoses under other disorders of nervous system in diseases classified elsewhere. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.
G99 questions
What does G99 mean?
G99 is the ICD-10-CM code for Other disorders of nervous system in diseases classified elsewhere. It is in chapter 6, Diseases of the nervous system (G00-G99).
Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.