F16.9Hallucinogen use, unspecified

F16.9 is the ICD-10-CM diagnosis code for hallucinogen use, unspecified. It belongs to category F16 (hallucinogen 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 7 subcodes must be used instead.

Within F16, choose F16.9 (use, unspecified) only when documentation doesn't support a more specific option: abuse (F16.1) and dependence (F16.2).

To report this condition, pick the subcode that matches the documentation: F16.90 (uncomplicated), F16.91 (in remission), F16.92 (with intoxication), F16.94 (with hallucinogen-induced mood disorder), F16.95 (with hallucinogen-induced psychotic disorder), F16.98 (with other specified hallucinogen-induced disorder) and F16.99 (with unspecified hallucinogen-induced disorder).

Don't report F16.9 together with the conditions in its Excludes1 note: hallucinogen abuse (F16.1-) and hallucinogen dependence (F16.2-).

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