ICD-10 Code F15.9 – Other stimulant use, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F15.9 – Other stimulant use, unspecified
What it is
F15.9 identifies stimulant use that is documented but not further specified. Use it when the record indicates stimulant-related use or disorder, yet the exact stimulant or pattern is not described.
Clinical signs
Clinical features vary; refer to documentation. Records may note stimulant use with nonspecific behavioral, mood, or physiologic effects, but the chart does not identify a more specific stimulant-related diagnosis.
When to use this code
Use this code when the provider documents stimulant use and does not name the substance or provide enough detail for a more specific F15 code. It also fits when the documentation is incomplete and you cannot safely assign a more specific diagnosis.
If the note later specifies the stimulant, severity, or associated disorder, code that more precise diagnosis instead. Do not infer details from medication lists, history alone, or testing without clear provider documentation.
Do not use for
Do not use F15.9 when the record identifies a specific stimulant or a different substance-related disorder. Check documentation for intoxication, withdrawal, dependence, or other specified stimulant use diagnoses.
Coding tip
If the provider’s note is vague, code only what is explicitly documented and query for clarification when a more specific stimulant diagnosis would change coding.