Billable / Specific Code
ICD-10-CM T45.91 is the diagnosis code for Poisoning by unspecified primarily systemic and hematological agent, 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 T45.91 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, T45.91 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
T45.91 is the ICD-10-CM diagnosis code for "Poisoning by unspecified primarily systemic and hematological agent, accidental (unintentional)". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of T45.91 is T45.9 ("Poisoning by, adverse effect of and underdosing of unspecified primarily systemic and hematological agent"). T45.91 provides a more specific classification within this category.
T45.91 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 T45.91 when the patients documented diagnosis matches "Poisoning by unspecified primarily systemic and hematological agent, 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 unspecified primarily systemic and hematological agent, accidental (unintentional) is T45.91.
Yes, T45.91 can be used as a primary diagnosis code since it is billable and specific.
T45.91 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, T45.91 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.