Billable / Specific Code
ICD-10-CM F16.921 is the diagnosis code for Hallucinogen use, unspecified with intoxication with delirium. 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 billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where F16.921 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, F16.921 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
F16.921 is the ICD-10-CM diagnosis code for "Hallucinogen use, unspecified with intoxication with delirium". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of F16.921 is F16.92 ("Hallucinogen use, unspecified with intoxication"). F16.921 provides a more specific classification within this category.
F16.921 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.
Use F16.921 when the patients documented diagnosis matches "Hallucinogen use, unspecified with intoxication with delirium" 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 Hallucinogen use, unspecified with intoxication with delirium is F16.921.
Yes, F16.921 can be used as a primary diagnosis code since it is billable and specific.
F16.921 is in Chapter 5 of the ICD-10-CM Tabular List.
Yes, F16.921 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.