F18.99 Inhalant use, unspecified with unspecified inhalant-induced disorder

The ICD-10-CM code for Inhalant use, unspecified with unspecified inhalant-induced disorder is F18.99 (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 F18

52 codes (39 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to F18.99:

• Use (of) › inhalants › with › unspecified disorder

U.S. Hospital Utilization

F18.99 appeared in too few sampled U.S. inpatient stays in 2023 to report a national estimate (AHRQ suppresses counts of 10 or fewer) — a rare inpatient 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.

Assign O99.32 + secondary F11-F16/F18-F19 for drug use

3) Drug use during pregnancy, childbirth and the puerperium Codes under subcategory O99.32, Drug use complicating pregnancy, childbirth, and the puerperium, should be assigned for any pregnancy case when a patient uses drugs during the pregnancy or postpartum. This can involve illegal drugs, or inappropriate use or abuse of prescription drugs. Secondary code(s) from categories F11-F16 and F18-F19 should also be assigned to identify manifestations of the drug use.

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)

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Reference F18.99 with the canonical source and edition:

F18.99 — Inhalant use, unspecified with unspecified inhalant-induced disorder. ICD-10 Coding Pro (ICD-10-CM FY2026). https://icd10codingpro.com/codes/F18.99

Canonical URL: https://icd10codingpro.com/codes/F18.99