G90.81
G90.81: Serotonin syndrome
Billable / specific codeICD-10-CM
G90.81 is a billable, specific ICD-10-CM code for serotonin syndrome. It is valid for submission on a claim.
Check G90.81 with the rest of the claim: free scrubberCode first
The underlying condition must be sequenced before this code.
- 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
Add a secondary code to capture the detail described below.
- 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)
- code, if applicable, to identify:
- disseminated intravascular coagulation (D65)
- hypertensive crisis (I16.-)
- metabolic acidosis (E87.2-)
- shock, not elsewhere classified (R57.-)
- toxic encephalopathy (G92.-)
- ventricular tachycardia (I47.2-)
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Serotonin toxicity
Risk adjustment
No CMS-HCC V28 category: this code does not change a RAF score.
Medicare coverage
G90.81 is named in 3 Medicare coverage policies: 3 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.
- A56612Billing and Coding: CT of the Head
- A56771Billing and Coding: Special Electroencephalography
- A57668Billing and Coding: Nerve Conduction Studies and Electromyography
Alphabetic index entries that lead here
- Syndrome›serotonin
Code history
- addedFY2024-FY2027
Serotonin syndrome