F16.99 – Hallucinogen use, unspecified with unspecified hallucinogen-induced disorder

ICD-10-CM 2027 diagnosis code · Mental and behavioral disorders due to psychoactive substance use

Billable code

ICD-10-CM code F16.99
Code
F16.99 (claims format: F1699)
Description
Hallucinogen use, unspecified with unspecified hallucinogen-induced disorder
Short description
Hallucinogen use, unsp w unsp hallucinogen-induced disorder
Billable
Yes – valid for HIPAA-covered transactions
Valid for
Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter
5. Mental, Behavioral and Neurodevelopmental disorders (F01-F99)
Block
F10-F19 Mental and behavioral disorders due to psychoactive substance use
Parent codes
F16 › F16.9

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

F16 – Hallucinogen related disorders

Includes:
  • ecstasy
  • PCP
  • phencyclidine

F16.9 – Hallucinogen use, unspecified

Excludes1 (not coded here):
  • hallucinogen abuse (F16.1-)
  • hallucinogen dependence (F16.2-)

Index terms for F16.99

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in F16.9

Frequently asked questions

What is ICD-10 code F16.99?

F16.99 is the ICD-10-CM code for hallucinogen use, unspecified with unspecified hallucinogen-induced disorder, in the block F10-F19 (Mental and behavioral disorders due to psychoactive substance use).

Is F16.99 a billable code?

Yes. F16.99 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does F16.99 belong to?

It belongs to category F16 – Hallucinogen related disorders.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.