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3. Chapter - G00-G99
4. Section - G89-G99
5. Category - G90
6. G90.81

G90.81 - Serotonin syndrome

• Applicable to Serotonin syndrome
• The 2025 edition of ICD10-CM G90.81 became effective on October 1, 2024.
• This is the American ICD10-CM version of G90.81 - other international versions of ICD10 G90.81 may differ.
• G90.81 is a Billable / Specific ICD10-CM code that can be used to indicate a diagnosis for reimbursement purposes.

Code 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)

• Serotonin toxicity

codefirst

• 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)

The following codes above G90.81 contain annotation back-references that may be applicable to G90.81:

• Chapter: G00-G99 - Diseases of the nervous system
• Section: G89-G99 - Other disorders of the nervous system
• Category: G90 - Disorders of autonomic nervous system

Browse other similar CM codes:

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.