G92.9 Unspecified toxic encephalopathy

✓ Billable ICD-10-CM 2026
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The ICD-10-CM code for Unspecified toxic encephalopathy is G92.9 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Section
G89-G99: Other disorders of the nervous system (G89-G99)
Category G92
10 codes (8 billable)
FY2026 Status
Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to G92.9:

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

U.S. Hospital Utilization

  • An estimated 62,575 U.S. inpatient stays in 2023 included G92.9 among the documented diagnoses.
  • 4,030 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Dominant/nondominant side (TOC entry)

a. Dominant/nondominant side ................................................................................................. 45

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.6.a
Pain - Category G89 (TOC entry)

b. Pain - Category G89.............................................................................................................. 45

— ICD-10-CM Official Guidelines for Coding and Reporting, FY2026, Section I.C.6.b

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

Related Codes

Parent Code

G92 Toxic encephalopathy

Related Codes in G92

G92 Toxic encephalopathy G92.0 Immune effector cell-associated neurotoxicity syndrome 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
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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