ICD-10-CM 2027 diagnosis code
G92Toxic encephalopathy
G92 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.
Code last changed in FY2022 (effective October 1, 2021). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About G92
G92 is the ICD-10-CM diagnosis code for toxic encephalopathy. It belongs to block G89-G99 (other disorders of the nervous system) and chapter 6 (diseases of the nervous system). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.
To report this condition, pick the subcode that matches the documentation: G92.0 (syndrome), G92.8 (encephalopathy) and G92.9 (encephalopathy).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2022 (expanded into subcodes).
Before ICD-10, this condition was coded in ICD-9-CM as 323.71 (toxic encephalitis and encephalomyelitis), 323.72 (toxic myelitis) and 349.82 (toxic encephalopathy).
Specific codes under G92
- G92.0Immune effector cell-associated neurotoxicity syndrome
- G92.00Immune effector cell-associated neurotoxicity syndrome, grade unspecifiedBillable
- G92.01Immune effector cell-associated neurotoxicity syndrome, grade 1Billable
- G92.02Immune effector cell-associated neurotoxicity syndrome, grade 2Billable
- G92.03Immune effector cell-associated neurotoxicity syndrome, grade 3Billable
- G92.04Immune effector cell-associated neurotoxicity syndrome, grade 4Billable
- G92.05Immune effector cell-associated neurotoxicity syndrome, grade 5Billable
- G92.8Other toxic encephalopathyBillable
- G92.9Unspecified toxic encephalopathyBillable
Notes that apply from higher levels
Instructions written at a parent level also apply to G92.
Broader instructions also apply from Chapter 6: Diseases of the nervous system.
Codes whose notes reference G92
- G90.81Use additional code
ICD-9-CM equivalent
Converter →- 323.71Toxic encephalitis and encephalomyelitisapproximate
- 323.72Toxic myelitisapproximate
- 349.82Toxic encephalopathyapproximate
From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- FY2022 (effective 10/1/2021): Expanded — no longer billable