G99 – Other disorders of nervous system in diseases classified elsewhere
ICD-10-CM 2027 diagnosis code · Other disorders of the nervous system
ICD-10-CM code
G99
- Code
G99(claims format:G99)- Description
- Other disorders of nervous system in diseases classified elsewhere
- Short description
- Oth disorders of nervous system in diseases classd elswhr
- Billable
- No – use a more specific code below
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 6. Diseases of the nervous system (G00-G99)
- Block
- G89-G99 Other disorders of the nervous system
Billable codes under G99
G99 is a header code and cannot be used on claims. Choose the most specific code:
Frequently asked questions
What is ICD-10 code G99?
G99 is the ICD-10-CM code for other disorders of nervous system in diseases classified elsewhere, in the block G89-G99 (Other disorders of the nervous system).
Is G99 a billable code?
No. G99 is a header code with more specific child codes; report one of the billable codes listed above.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.