2026 ICD-10-CM Diagnosis Code F16.959Hallucinogen use, unspecified with hallucinogen-induced psychotic disorder, unspecified

ICD-10-CM Codes›F01–F99›F10-F19›F16

ICD-10-CM F16.959
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F16.959 is a billable ICD-10-CM diagnosis code for hallucinogen use, unspecified with hallucinogen-induced psychotic disorder, unspecified. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 894 through 897. Coders also document this condition as phencyclidine induced mental problem. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Hallucinogen-related disorders and Schizophrenia spectrum and other psychotic disorders.

Code Identity

ICD-10-CM Code
F16.959
Billable Status
Yes — Valid for Submission
Code Describes
Hallucinogen use, unspecified with hallucinogen-induced psychotic disorder, unspecified
Short Description
Hallucinogen use, unsp w psychotic disorder, unsp
Parent Code
F16.95
Hallucinogen use, unspecified with hallucinogen-induced psychotic disorder

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF10-F19Mental and behavioral disorders due to psychoactive substance use
CategoryF16Hallucinogen related disorders
This CodeF16.959Hallucinogen use, unspecified with hallucinogen-induced psychotic disorder, unspecified

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Phencyclidine induced mental problem
  • Psychotic disorder caused by hallucinogen
  • Psychotic disorder caused by phencyclidine

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Other hallucinogen induced psychotic disorder, without use disorder
  • Phencyclidine induced psychotic disorder, without use disorder

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Phencyclidine-induced
      • psychotic disorder
    • Use(of)
      • hallucinogen NEC
        • with
          • psychosis

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MBD022
Hallucinogen-related disorders
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR MBD001
Schizophrenia spectrum and other psychotic disorders
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Drug Use and Addiction

Drugs are chemical substances that can change how your body and mind work. They include prescription medicines, over-the-counter medicines, alcohol, tobacco, and illegal drugs.

The full article covers:

  • What are drugs?
  • What is drug use?
  • What is drug addiction?
  • Does everyone who takes drugs become addicted?
  • Who is at risk for drug addiction?
  • What are the signs that someone has a drug problem?
  • What are the treatments for drug addiction?
  • Can drug use and addiction be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert F16.959 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
292.89 Drug mental disorder NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About F16.959Overview

Is F16.959 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report hallucinogen use, unspecified with hallucinogen-induced psychotic disorder, unspecified on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does F16.959 group to?

When hallucinogen use, unspecified with hallucinogen-induced psychotic disorder, unspecified is the principal diagnosis on an inpatient stay, it groups to MS-DRG 894, 895, 896, 897, with relative weights from 0.6169 to 1.7451 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of F16.959?

Under the General Equivalence Mappings, hallucinogen use, unspecified with hallucinogen-induced psychotic disorder, unspecified converts to ICD-9-CM 292.89 (drug mental disorder NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.