Other disorders of the nervous system (G89-G99) ICD-10-CM
The G89–G99 section covers other disorders of the nervous system with 146 ICD-10-CM diagnosis codes, of which 112 are billable in fiscal year 2027. The section is organized into the 11 code ranges listed below.
Code Ranges in This Section 11 ranges · 146 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the G89–G99 Code Range
These conditions include pain, excess fluid inside the skull, and disorders affecting the brain, spinal cord, or other parts of the nervous system.
The categories separate pain (G89), autonomic nervous system disorders (G90), and hydrocephalus, or excess fluid inside the skull (G91). Pain subdivisions distinguish acute and chronic pain, pain related to a neoplasm, and named pain syndromes. Hydrocephalus subdivisions distinguish its named forms, including obstructive and post-traumatic hydrocephalus.
G92 addresses toxic brain disorders. G93 and G94 address other brain disorders, while G95 focuses on spinal cord diseases. G96 groups other central nervous system disorders. G97 separates nervous system complications during or after a procedure by the type of complication. G98 and G99 address other nervous system disorders, with G99 specifying disorders in diseases classified elsewhere.
Questions About This Page
How many codes are in the G89-G99 range?
The G89-G99 range contains 146 ICD-10-CM diagnosis codes in FY 2027. 112 of them are billable, and the rest are category headers that organize the section.
What conditions does G89-G99 cover?
The range covers other disorders of the nervous system. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
