Is F16.18 a billable ICD-10-CM code?

No. F16.18 is a non-billable header code. Code to a higher level of specificity using one of its child codes.

Where does F16.18 sit in the tabular list?

Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Mental and behavioral disorders due to psychoactive substance use (F10-F19).

What cannot be coded together with F16.18?

F16.18 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above F16.18 (F16.1) and apply to it just the same.

F16.18

F16.18 — Hallucinogen abuse with other hallucinogen-induced disorder

Non-billable headerICD-10-CM

F16.18 is a non-billable header ICD-10-CM code for hallucinogen abuse with other hallucinogen-induced disorder. It cannot be billed on its own: choose one of the more specific child codes below.

Excludes1 inherited from the categories above F16.18

These are not written on F16.18, but they bind it: a note on a category applies to every code beneath it. Billing F16.18 with anything listed here is a denial.

Written on F16.1 — Hallucinogen abuse

hallucinogen dependence (F16.2-)
hallucinogen use, unspecified (F16.9-)

Risk adjustment

F16.18 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Code history

F16.18 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Code to one of these instead F16.18

3 child codes. Green means billable.

Related codes at this level

Codes that share F16.1. If F16.18 is not quite right, the correct code is usually one of these.

Questions about F16.18

Is F16.18 a billable ICD-10-CM code?: No. F16.18 is a non-billable header code. Code to a higher level of specificity using one of its child codes.
Where does F16.18 sit in the tabular list?: Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Mental and behavioral disorders due to psychoactive substance use (F10-F19).
What cannot be coded together with F16.18?: F16.18 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above F16.18 (F16.1) and apply to it just the same.