ICD-10 Code F11.9 – Opioid use, unspecified (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code F11.9 – Opioid use, unspecified
What it is
F11.9 identifies opioid use when the record does not specify whether the use is uncomplicated, harmful, or dependent. Use it only when documentation supports opioid use but gives no further detail.
Clinical signs
Clinical features vary; refer to documentation. Records may note opioid use without clear evidence of intoxication, withdrawal, abuse, dependence, or an opioid-induced disorder.
When to use this code
Use this code when the clinician documents opioid use and does not specify the pattern or related disorder. It can fit brief problem lists, incomplete histories, or encounters where the chart confirms opioid use but lacks enough detail for a more specific F11 code.
If the note later clarifies misuse, dependence, or another opioid-related condition, you should code that more specific diagnosis instead. Check documentation for the exact wording and any linked substance-use diagnosis.
Do not use for
Do not use F11.9 when the record clearly states opioid dependence, abuse, intoxication, withdrawal, or opioid-induced conditions. Those situations require a more specific code.
Coding tip
Review the provider’s wording closely; unspecified codes are appropriate only when the documentation truly lacks further detail.