Non-Billable / Non-Specific Code
ICD-10-CM T42.3 is the diagnosis code for Poisoning by, adverse effect of and underdosing of barbiturates. 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 non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
The following conditions should never be coded at the same time as T42.3. They are mutually exclusive:
Understanding where T42.3 sits in the ICD-10-CM classification helps ensure proper coding:
No, T42.3 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
T42.3 is the ICD-10-CM diagnosis code for "Poisoning by, adverse effect of and underdosing of barbiturates". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of T42.3 is T42 ("Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs"). T42.3 provides a more specific classification within this category.
T42.3 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.
T42.3 has 1 sub-code(s) that provide more specific detail: T42.3X.
Use T42.3 when the patients documented diagnosis matches "Poisoning by, adverse effect of and underdosing of barbiturates" 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, adverse effect of and underdosing of barbiturates is T42.3.
No, T42.3 is non-billable. Use a more specific sub-code for primary diagnosis billing.
T42.3 is in Chapter 19 of the ICD-10-CM Tabular List.
Type 1 Excludes for T42.3 include: poisoning by, adverse effect of and underdosing of thiobarbiturates (T41.1-).
Yes, T42.3 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.