Billable / Specific Code
ICD-10-CM T65.891 is the diagnosis code for Toxic effect of other specified substances, accidental (unintentional). This code falls under the section "Toxic effects of substances chiefly nonmedicinal as to source" 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 T65.891 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, T65.891 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
T65.891 is the ICD-10-CM diagnosis code for "Toxic effect of other specified substances, accidental (unintentional)". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of T65.891 is T65.89 ("Toxic effect of other specified substances"). T65.891 provides a more specific classification within this category.
T65.891 is located in Section T51-T65 — "Toxic effects of substances chiefly nonmedicinal as to source" within Chapter 19 of the ICD-10-CM Tabular List.
Use T65.891 when the patients documented diagnosis matches "Toxic effect of other specified substances, 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 Toxic effect of other specified substances, accidental (unintentional) is T65.891.
Yes, T65.891 can be used as a primary diagnosis code since it is billable and specific.
T65.891 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, T65.891 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.