ICD-10-CM 2027
ICD-10 code for toxic encephalopathy
From the official ICD-10-CM alphabetic index entry “Encephalopathy (acute) › toxic”. Page updated September 29, 2026.
About coding toxic encephalopathy
The ICD-10-CM code for toxic encephalopathy is G92.9 (Unspecified toxic encephalopathy). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on G92.9.
Within G92, choose G92.9 (Unspecified toxic encephalopathy) only when documentation doesn't support a more specific option: immune effector cell-associated neurotoxicity syndrome (G92.0) and other toxic encephalopathy (G92.8).
Code first: poisoning due to drug or toxin, if applicable, (T36-T65 with fifth or sixth character 1-4).
Use an additional code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5).
More specific toxic encephalopathy codes (official index)
- metabolic G92.8 — Other toxic encephalopathy
Common questions about toxic encephalopathy ICD-10 codes
What is the ICD-10 code for toxic encephalopathy?
- G92.9 — Unspecified toxic encephalopathy. More specific codes apply when the documentation supports them: G92.8.
What is the ICD-10 code for metabolic toxic encephalopathy?
- G92.8 — Other toxic encephalopathy.
Is G92.9 billable?
- Yes. G92.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can G92.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict G92.9 as a principal diagnosis.
Is G92.9 a CC or MCC?
- G92.9 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.