Billable / Specific Code
ICD-10-CM T59.91 is the diagnosis code for Toxic effect of unspecified gases, fumes and vapors, 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.
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 T59.91 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, T59.91 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
T59.91 is the ICD-10-CM diagnosis code for "Toxic effect of unspecified gases, fumes and vapors, accidental (unintentional)". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of T59.91 is T59.9 ("Toxic effect of unspecified gases, fumes and vapors"). T59.91 provides a more specific classification within this category.
T59.91 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 T59.91 when the patients documented diagnosis matches "Toxic effect of unspecified gases, fumes and vapors, 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 unspecified gases, fumes and vapors, accidental (unintentional) is T59.91.
Yes, T59.91 can be used as a primary diagnosis code since it is billable and specific.
T59.91 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, T59.91 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.