Non-Billable / Non-Specific Code
ICD-10-CM F18.9 is the diagnosis code for Inhalant use, unspecified. This code falls under the section "Mental and behavioral disorders due to psychoactive substance use" within Chapter 5 — Mental, Behavioral and Neurodevelopmental disorders (F01-F99). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as F18.9. They are mutually exclusive:
Understanding where F18.9 sits in the ICD-10-CM classification helps ensure proper coding:
No, F18.9 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
F18.9 is the ICD-10-CM diagnosis code for "Inhalant use, unspecified". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of F18.9 is F18 ("Inhalant related disorders"). F18.9 provides a more specific classification within this category.
F18.9 is located in Section F10-F19 — "Mental and behavioral disorders due to psychoactive substance use" within Chapter 5 of the ICD-10-CM Tabular List.
F18.9 has 8 sub-code(s) that provide more specific detail: F18.90, F18.91, F18.92, F18.94, F18.95 and more.
Use F18.9 when the patients documented diagnosis matches "Inhalant use, unspecified" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Inhalant use, unspecified is F18.9.
No, F18.9 is non-billable. Use a more specific sub-code for primary diagnosis billing.
F18.9 is in Chapter 5 of the ICD-10-CM Tabular List.
Type 1 Excludes for F18.9 include: inhalant abuse (F18.1-); inhalant dependence (F18.2-).
Yes, F18.9 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.