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 2026. 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
ICD-10 codes G89-G99 cover a broad group of nervous system disorders that include complex pain syndromes, autonomic nervous system conditions, hydrocephalus types, toxic encephalopathies, brain and spinal cord disorders, and complications related to neurological procedures. These codes are used to document specific neurological conditions not categorized elsewhere, ensuring precise diagnosis and treatment tracking.
This range uniquely categorizes pain syndromes such as central pain syndrome (G89.0) and complex regional pain syndrome type I (G90.5), linking common terms like central neuropathic pain and reflex sympathetic dystrophy to proper coding. It also addresses diverse autonomic nervous system disorders from idiopathic neuropathies to familial dysautonomia (G90.1). The extensive hydrocephalus codes (G91) differentiate between communicating, obstructive, and post-traumatic types. Toxic encephalopathy (G92) codes specify various grades of immune effector cell-associated neurotoxicity, facilitating documentation of treatment-related neurotoxicity. Codes from G93 detail brain disorders including anoxic brain damage and benign intracranial hypertension, while G95 includes spinal cord diseases such as syringomyelia and vascular myelopathies. Importantly, G97 codes cover intraoperative and postprocedural neurologic complications, helping capture surgical adverse events. Using these precise codes helps clinicians and coders accurately represent complex neurological conditions, improving patient care and data accuracy.
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 2026. 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 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
