ICD-10 Code F19.9 – Other psychoactive substance use, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F19.9 – Other psychoactive substance use, unspecified
What it is
Use this code for psychoactive substance use that is documented, but the specific substance is not identified. It indicates a substance-related condition without enough detail to assign a more precise code.
Clinical signs
Clinical features vary; refer to documentation. You may see substance use noted in the record with nonspecific mental, behavioral, or physical effects, but the exact drug or class is not named.
When to use this code
Assign this code when the provider documents psychoactive substance use and does not specify the substance involved. It is also appropriate when the chart confirms use but the record lacks detail needed for a more specific diagnosis. Check documentation if use, abuse, or dependence is unclear.
Do not use for
Do not use this code when the substance is identified and a more specific F19 code applies. Do not use it if the record supports intoxication, withdrawal, or another defined substance-related disorder instead.
Coding tip
Query the provider when the substance name or related disorder is missing, because a more specific code may be available.