ICD-10-CM Code T45.0X1A

Poisoning by antiallergic and antiemetic drugs, accidental (unintentional), initial encounter

Version 2020 Replaced Code Billable Code

Valid for Submission

T45.0X1A is a billable code used to specify a medical diagnosis of poisoning by antiallergic and antiemetic drugs, accidental (unintentional), initial encounter. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code T45.0X1A might also be used to specify conditions or terms like 5-ht3-receptor antagonist overdose, 5-ht3-receptor antagonist poisoning, accidental 5-ht3-receptor antagonist overdose, accidental 5-ht3-receptor antagonist poisoning, accidental chlorphenamine overdose, accidental chlorphenamine poisoning, etc

Short Description:Poisoning by antiallerg/antiemetic, accidental, init
Long Description:Poisoning by antiallergic and antiemetic drugs, accidental (unintentional), initial encounter

Replaced Code

This code was replaced in the 2020 ICD-10 code set with the code(s) listed below. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2019. This code was replaced for the FY 2020 (October 1, 2019 - September 30, 2020).

  • K59.03 - Drug induced constipation


The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

  • 5-HT3-receptor antagonist overdose
  • 5-HT3-receptor antagonist poisoning
  • Accidental 5-HT3-receptor antagonist overdose
  • Accidental 5-HT3-receptor antagonist poisoning
  • Accidental chlorphenamine overdose
  • Accidental chlorphenamine poisoning
  • Accidental diphenhydramine overdose
  • Accidental diphenhydramine poisoning
  • Accidental diphenylpyraline overdose
  • Accidental diphenylpyraline poisoning
  • Accidental domperidone overdose
  • Accidental domperidone poisoning
  • Accidental metoclopramide overdose
  • Accidental metoclopramide poisoning
  • Accidental thonzylamine overdose
  • Accidental tripelennamine overdose
  • Antiallergenic drug overdose
  • Antiallergenic drug poisoning
  • Antiemetic overdose
  • Antiemetic poisoning
  • Chlorphenamine overdose
  • Chlorphenamine poisoning
  • Diphenhydramine overdose
  • Diphenylpyraline overdose
  • Domperidone overdose
  • Domperidone poisoning
  • Metoclopramide overdose
  • Metoclopramide poisoning
  • Poisoning by antihistamine
  • Poisoning by diphenhydramine
  • Poisoning by diphenylpyraline
  • Poisoning by thonzylamine
  • Poisoning by tripelennamine
  • Thonzylamine overdose
  • Tripelennamine overdose

Diagnostic Related Groups

The ICD-10 code T45.0X1A is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2019 through 09/30/2020.


Convert T45.0X1A to ICD-9

  • 963.0 - Pois-antiallrg/antiemet (Combination Flag)
  • E858.8 - Acc poisoning-drug NEC (Combination Flag)

Code Classification

  • Injury, poisoning and certain other consequences of external causes (S00–T98)
    • Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances (T36-T50)
      • Primarily systemic and hematological agents, NEC (T45)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients

Medication Errors

Medicines treat infectious diseases, prevent problems from chronic diseases, and ease pain. But medicines can also cause harmful reactions if not used correctly. Errors can happen in the hospital, at the health care provider's office, at the pharmacy, or at home. You can help prevent errors by

  • Knowing your medicines. When you get a prescription, ask the name of the medicine and check to make sure that the pharmacy gave you the right medicine. Make sure that you understand how often you should take the medicine and how long you should take it.
  • Keeping a list of medicines.
    • Write down all of the medicines that you are taking, including the names of your medicines, how much you take, and when you take them. Make sure to include any over-the-counter medicines, vitamins, supplements, and herbs that you take.
    • List the medicines that you are allergic to or that have caused you problems in the past.
    • Take this list with you every time you see a health care provider.
  • Reading medicine labels and following the directions. Don't just rely on your memory - read the medication label every time. Be especially careful when giving medicines to children.
  • Asking questions. If you don't know the answers to these questions, ask your health care provider or pharmacist:
    • Why am I taking this medicine?
    • What are the common side effects?
    • What should I do if I have side effects?
    • When should I stop this medicine?
    • Can I take this medicine with the other medicines and supplements on my list?
    • Do I need to avoid certain foods or alcohol while taking this medicine?

Food and Drug Administration

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