F18.90 ICD-10-CM Code: Inhalant use, unspecified, uncomplicated

F18.90 is the ICD-10-CM diagnosis code for inhalant use, unspecified, uncomplicated. This code describes a patient who uses inhalant substances (such as glue, paint thinner, or aerosols) but the specific pattern of use and any related complications are not documented. It is used when there is evidence of inhalant use but insufficient information to classify it as abuse or dependence. F18.90 sits in the ICD-10-CM chapter for mental, behavioral and neurodevelopmental disorders (f01-f99), within the section covering mental and behavioral disorders due to psychoactive substance use (f10-f19).

F18.90 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.

Use this code only when documentation indicates inhalant use without specifying abuse, dependence, or complications; if abuse or dependence is documented, use F18.1x or F18.2x codes instead.