Toxic encephalopathy (G92) ICD-10-CM
The G92 code range covers toxic encephalopathy with 10 ICD-10-CM diagnosis codes. 8 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the G92 Range 10 codes · 8 billable
- G92 Toxic encephalopathyNon-billable
- G92.0 Immune effector cell-associated neurotoxicity syndromeNon-billable
- G92.00 Immune effector cell-associated neurotoxicity syndrome, grade unspecified
- G92.01 Immune effector cell-associated neurotoxicity syndrome, grade 1
- G92.02 Immune effector cell-associated neurotoxicity syndrome, grade 2
- G92.03 Immune effector cell-associated neurotoxicity syndrome, grade 3
- G92.04 Immune effector cell-associated neurotoxicity syndrome, grade 4
- G92.05 Immune effector cell-associated neurotoxicity syndrome, grade 5
- G92.8 Other toxic encephalopathy
- G92.9 Unspecified toxic encephalopathy
About the G92 Code Range
ICD-10 code G92 identifies cases of toxic encephalopathy, a brain disorder resulting from exposure to harmful substances. This section is essential for coding different types and severities of brain toxicity caused by drugs, chemicals, or metabolic disturbances.
The main code, G92, covers toxic encephalopathy broadly, while subdivisions specify particular conditions. The series from G92.0 to G92.05 define immune effector cell-associated neurotoxicity syndrome, often related to treatments like CAR T-cell therapy, graded by severity. G92.8 captures other toxic encephalopathies and includes conditions also known as toxic encephalitis or hyperammonemic encephalopathy, linked to various toxins and metabolic imbalances. Finally, G92.9 is used for unspecified toxic encephalopathy cases and includes poisoning from metals like lead, mercury, or arsenic, and exposure to substances such as carbon monoxide or organophosphates. Understanding the distinctions in these codes helps ensure precise documentation for toxic brain conditions caused by different agents.
Questions About This Page
How many billable codes are in the G92 range?
Of the 10 codes in this range, 8 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the G92 range classify?
The range classifies toxic encephalopathy. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
