2025
ICD-10-CM
Diagnosis
Code

G90.81 Serotonin syndrome

  • Billable
  • 2025–2025

G90.81 is a new billable/specific diagnosis code introduced in the 2025 ICD-10-CM used to classify the following condition: Serotonin syndrome.

Inclusion term

  • Serotonin toxicity

Code first

  • Poisoning due to drug or toxin, such as:

    • Linezolid (T36.8X- with sixth character 1-4)

    • Monoamine oxidase inhibitors (T43.1X with sixth character 1-4)

    • Selective serotonin and norepinephrine reuptake inhibitors [SSNRI] (T43.21 with sixth character 1-4)

    • Selective serotonin reuptake inhibitors [SSRI] (T43.22 with sixth character 1-4)

Use additional code

  • Code for adverse effect, if applicable, to identify drug, such as:

    • Linezolid (T36.8X5)

    • Monoamine oxidase inhibitors (T43.1X5)

    • Selective serotonin and norepinephrine reuptake inhibitors [SSNRI] (T43.215)

    • Selective serotonin reuptake inhibitors [SSRI] (T43.225)

Versions

  1. 2025

    New code