G92.9 Unspecified toxic encephalopathy

Billable ICD-10-CM code, FY2026. Acts as a Major Complication or Comorbidity (MCC) as a secondary diagnosis.

Code first

• poisoning due to drug or toxin, if applicable, (T36-T65 with fifth or sixth character 1-4)

Use additional code

• code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5)

MS-DRG index

Defines the logic of DRG(s) 023-024 in MDC 01.

Code annotations containing back-references to G92.9

Back-references to G92

• Use Additional: G90.81 Serotonin syndrome ("toxic encephalopathy (G92.-)")

Diagnosis Index entries for G92.9

• Encephalopathy (acute) › toxic
• Myelitis (acute) (ascending) (childhood) (chronic) (descending) (diffuse) (disseminated) (idiopathic) (pressure) (progressive) (spinal cord) (subacute) › toxic

Nearby codes

• 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 (this code)