Billable / Specific Code
ICD-10-CM T44.991 is the diagnosis code for Poisoning by other drug primarily affecting the autonomic nervous system, 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 T44.991 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, T44.991 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
T44.991 is the ICD-10-CM diagnosis code for "Poisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional)". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of T44.991 is T44.99 ("Poisoning by, adverse effect of and underdosing of other drugs primarily affecting the autonomic nervous system"). T44.991 provides a more specific classification within this category.
T44.991 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 T44.991 when the patients documented diagnosis matches "Poisoning by other drug primarily affecting the autonomic nervous system, 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 drug primarily affecting the autonomic nervous system, accidental (unintentional) is T44.991.
Yes, T44.991 can be used as a primary diagnosis code since it is billable and specific.
T44.991 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, T44.991 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.