F16.9
Hallucinogen use, unspecified
Not billable — category only FY2026 2025-10-01 → 2026-09-30
This is the unspecified option. 2 more
specific codes sit alongside it. Worth
checking whether the documentation supports one of them.
Exclusions 3 never code together
F16.9code
F01-F99chapter
Excludes2
- symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)R00-R99
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
Excludes2 — not included here, but the patient may have both. Code both when documented.
Instructional notes 4
Index entries leading here filed at null
No alphabetic index entry points at this code.
Alongside this code 2 same parent — F16
Subordinate codes 7
F16.90 Hallucinogen use, unspecified, uncomplicated F16.91 Hallucinogen use, unspecified, in remission F16.92 Hallucinogen use, unspecified with intoxication F16.94 Hallucinogen use, unsp w hallucinogen-induced mood disorder F16.95 Hallucinogen use, unsp w psychotic disorder F16.98 Hallucinogen use, unsp w oth hallucinogen-induced disorder F16.99 Hallucinogen use, unsp w unsp hallucinogen-induced disorder
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.