F18.9Inhalant use, unspecified

F18.9 is the ICD-10-CM diagnosis code for Inhalant use, unspecified. It belongs to category F18 (Inhalant related disorders), block F10-F19 (mental and behavioral disorders due to psychoactive substance use) and chapter 5 (mental, Behavioral and Neurodevelopmental disorders). It is a header code, so it can't be reported by itself; one of its 8 subcodes must be used instead.

Within F18, choose F18.9 (use, unspecified) only when documentation doesn't support a more specific option: abuse (F18.1) and dependence (F18.2).

To report this condition, pick the subcode that matches the documentation: F18.90 (uncomplicated), F18.91 (in remission), F18.92 (with intoxication), F18.94 (with inhalant-induced mood disorder), F18.95 (with inhalant-induced psychotic disorder), F18.97 (with inhalant-induced persisting dementia), F18.98 (with other inhalant-induced disorders) and F18.99 (with unspecified inhalant-induced disorder).

Don't report F18.9 together with the conditions in its Excludes1 note: inhalant abuse (F18.1-) and inhalant dependence (F18.2-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.