Billable / Specific Code
ICD-10-CM T40.691 is the diagnosis code for Poisoning by other narcotics, accidental (unintentional). 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.
Understanding where T40.691 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, T40.691 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
T40.691 is the ICD-10-CM diagnosis code for "Poisoning by other narcotics, accidental (unintentional)". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of T40.691 is T40.69 ("Poisoning by, adverse effect of and underdosing of other narcotics"). T40.691 provides a more specific classification within this category.
T40.691 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 T40.691 when the patients documented diagnosis matches "Poisoning by other narcotics, accidental (unintentional)" 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 other narcotics, accidental (unintentional) is T40.691.
Yes, T40.691 can be used as a primary diagnosis code since it is billable and specific.
T40.691 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, T40.691 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.