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G90.81

✓ Billable

Serotonin syndrome

Diseases of the nervous system (G00-G99)

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Also Known As

Serotonin toxicity

📋 Code Instructions

  • • Code first: poisoning due to drug or toxin, such as:
  • • Code first: linezolid (T36.8X- with sixth character 1-4)
  • • Code first: monoamine oxidase inhibitors (T43.1X with sixth character 1-4)
  • • Code first: selective serotonin and norepinephrine reuptake inhibitors [SSNRI] (T43.21 with sixth character 1-4)
  • • Code first: selective serotonin reuptake inhibitors [SSRI] (T43.22 with sixth character 1-4)

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Code Information

CodeG90.81
BillableYes
ParentG90.8
CategoryDiseases of the nervous system (G00-G99)
Excludes10 rule(s)
Excludes20 note(s)

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)