Billable / Specific Code
ICD-10-CM T40.996 is the diagnosis code for Underdosing of other psychodysleptics [hallucinogens]. This code falls under the section "Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances" within Chapter 19 — Injury, poisoning and certain other consequences of external causes (S00-T88). 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.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where T40.996 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, T40.996 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
T40.996 is the ICD-10-CM diagnosis code for "Underdosing of other psychodysleptics [hallucinogens]". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of T40.996 is T40.99 ("Poisoning by, adverse effect of and underdosing of other psychodysleptics [hallucinogens]"). T40.996 provides a more specific classification within this category.
T40.996 is located in Section T36-T50 — "Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances" within Chapter 19 of the ICD-10-CM Tabular List.
Use T40.996 when the patients documented diagnosis matches "Underdosing of other psychodysleptics [hallucinogens]" 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 Underdosing of other psychodysleptics [hallucinogens] is T40.996.
Yes, T40.996 can be used as a primary diagnosis code since it is billable and specific.
T40.996 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, T40.996 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.