G99 Other disorders of nervous system in diseases classified elsewhere

The ICD-10-CM code for Other disorders of nervous system in diseases classified elsewhere is G99 (FY2026). It is a non-billable category code — select a more specific code below for claims.

Classification

Chapter

6: Diseases of the nervous system (G00-G99)

Section

G89-G99: Other disorders of the nervous system (G89-G99)

Category G99

4 codes (3 billable)

FY2026 Status

Stable since FY2024

Official Coding Guidelines

Chapter 6 TOC entry

6. Chapter 6: Diseases of the Nervous System (G00-G99) ........................................................ 45

Dominant/nondominant side (TOC entry)

a. Dominant/nondominant side ................................................................................................. 45

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool