ICD-10 Code F15.921 – Other stimulant use, unspecified with intoxication delirium (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F15.921 – Other stimulant use, unspecified with intoxication delirium
What it is
This code identifies intoxication delirium caused by use of other stimulants, when the specific stimulant is not named. It reflects an acute substance-related delirium, not routine stimulant use or simple intoxication.
Clinical signs
Clinical features vary; refer to documentation. Delirium typically includes disturbed attention, confusion, disorganized thinking, and a reduced awareness of the environment, occurring in the setting of stimulant intoxication.
When to use this code
Use F15.921 when the record documents delirium due to an unspecified stimulant or “other stimulant” and the provider links the mental status change to intoxication. You should code it when the presentation is acute and clearly substance-related. Check documentation if the stimulant type is not identified.
Do not use for
Do not use this code for stimulant use without delirium, or for withdrawal-related states. It is also inappropriate when the chart describes another specific stimulant category or a non-intoxication mental disorder.
Coding tip
Verify that delirium is explicitly documented and that the stimulant is unspecified or classified as “other” before assigning this code.