F16.959 Hallucinogen use, unspecified with hallucinogen-induced psychotic disorder, unspecified

The ICD-10-CM code for Hallucinogen use, unspecified with hallucinogen-induced psychotic disorder, unspecified is F16.959 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

5: Mental, Behavioral and Neurodevelopmental disorders (F01-F99)

Section

F10-F19: Mental and behavioral disorders due to psychoactive substance use (F10-F19)

Category F16

53 codes (40 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to F16.959:

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

Inclusion Terms

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

U.S. Hospital Utilization

• An estimated 325 U.S. inpatient stays in 2023 included F16.959 among the documented diagnoses.
• 120 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Unspecified psychoactive substance use (F10.9-–F19.9-)

3) Psychoactive Substance Use, Unspecified As with all other unspecified diagnoses, the codes for unspecified psychoactive substance use (F10.9-, F11.9-, F12.9-, F13.9-, F14.9-, F15.9-, F16.9-, F18.9-, F19.9-) should only be assigned based on provider documentation and when they meet the definition of a reportable diagnosis (see Section III, Reporting Additional Diagnoses). These codes are to be used only when the psychoactive substance use is associated with a substance related disorder (chapter 5 disorders such as sexual dysfunction, sleep disorder, or a mental or behavioral disorder) or medical condition, and such a relationship is documented by the provider.

Pain disorders related to psychological factors (TOC entry)

a. Pain disorders related to psychological factors ..................................................................... 43

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)

Cite This Page

Reference F16.959 with the canonical source and edition:

F16.959 — Hallucinogen use, unspecified with hallucinogen-induced psychotic disorder, unspecified. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/F16.959

Canonical URL: https://icd10codingpro.com/codes/F16.959