G99.8 – Other specified disorders of nervous system in diseases classified elsewhere
ICD-10-CM 2027 diagnosis code · Other disorders of the nervous system
ICD-10-CM code
G99.8
- Code
G99.8(claims format:G998)- Description
- Other specified disorders of nervous system in diseases classified elsewhere
- Short description
- Oth disrd of nervous system in diseases classified elsewhere
- Billable
- Yes – valid for HIPAA-covered transactions
- 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
- Parent codes
- G99
Notes for G99.8
Excludes1 (not coded here):
Index terms for G99.8
Entries in the ICD-10-CM alphabetic index that lead to this code:
Related codes in G99
Frequently asked questions
What is ICD-10 code G99.8?
G99.8 is the ICD-10-CM code for other specified disorders of nervous system in diseases classified elsewhere, in the block G89-G99 (Other disorders of the nervous system).
Is G99.8 a billable code?
Yes. G99.8 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does G99.8 belong to?
It belongs to category G99 – Other disorders of nervous system in diseases classified elsewhere.
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.