Non-Billable / Non-Specific Code
ICD-10-CM T40 is the diagnosis code for Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]. This code falls under the section "Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances" within Chapter 19 â Injury, poisoning and certain other consequences of external causes (S00-T88). 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 are not included in T40. If the patient has both, code each condition separately:
Understanding where T40 sits in the ICD-10-CM classification helps ensure proper coding:
No, T40 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
T40 is the ICD-10-CM diagnosis code for "Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
T40 is located in Section T36-T50 â "Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances" within Chapter 19 of the ICD-10-CM Tabular List.
T40 has 10 sub-code(s) that provide more specific detail: T40.0, T40.1, T40.2, T40.3, T40.4 and more.
Use T40 when the patients documented diagnosis matches "Poisoning by, adverse effect of and underdosing of narcotics and 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 Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens] is T40.
No, T40 is non-billable. Use a more specific sub-code for primary diagnosis billing.
T40 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, T40 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.