2026 ICD-10-CM Diagnosis Code F16.90Hallucinogen use, unspecified, uncomplicated

ICD-10-CM Codes›F01–F99›F10-F19›F16

ICD-10-CM F16.90
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

F16.90 is a billable ICD-10-CM diagnosis code for hallucinogen use, unspecified, uncomplicated. 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 hallucinogen use disorder. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Hallucinogen-related disorders.

Code Identity

ICD-10-CM Code
F16.90
Billable Status
Yes — Valid for Submission
Code Describes
Hallucinogen use, unspecified, uncomplicated
Short Description
Hallucinogen use, unspecified, uncomplicated
Same as the full description in the CMS dataset.
Parent Code
F16.9
Hallucinogen use, unspecified

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF10-F19Mental and behavioral disorders due to psychoactive substance use
CategoryF16Hallucinogen related disorders
This CodeF16.90Hallucinogen use, unspecified, uncomplicated

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Hallucinogen use disorder
  • Ketamine use disorder
  • Phencyclidine use disorder
  • Use of psilocybin

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.

    • LSD reaction(acute) (without dependence)
    • Use(of)
      • hallucinogen NEC

Clinical ClassificationClinical

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

CCSR MBD022
Hallucinogen-related disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

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 F16.90 to ICD-9-CMHistory

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

ICD-9-CM
305.30 Hallucinog abuse-unspec
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 F16.90Overview

Is F16.90 (Hallucinogen use, unspecified) a billable code?

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

What MS-DRG does F16.90 group to?

When hallucinogen use, unspecified, uncomplicated 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 F16.90?

Under the General Equivalence Mappings, hallucinogen use, unspecified, uncomplicated converts to ICD-9-CM 305.30 (hallucinog abuse-unspec). 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.