F16.1 vs F16.9
F16.1 (Hallucinogen abuse) compared with F16.9 (Hallucinogen use, unspecified), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. F16.1 carries an Excludes1 note covering F16.9: “hallucinogen use, unspecified (F16.9-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. F16.9 carries an Excludes1 note covering F16.1: “hallucinogen abuse (F16.1-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| F16.1Hallucinogen abuse | F16.9Hallucinogen use, unspecified | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) |
| Definition | Hallucinogen abuse is a non-billable ICD-10-CM category code (F16.1). | Hallucinogen use, unspecified is a non-billable ICD-10-CM category code (F16.9). |
| Includes | ecstasy PCP phencyclidine | ecstasy PCP phencyclidine |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources