2021 ICD-10-CM Code T40.604

Poisoning by unspecified narcotics, undetermined

Version 2021
Replaced Code
Non-Billable Code
Unspecified Code
Poisoning Undetermined

Not Valid for Submission

T40.604 is a "header" nonspecific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of poisoning by unspecified narcotics, undetermined. The code is NOT valid for the year 2021 for the submission of HIPAA-covered transactions. Category or Header define the heading of a category of codes that may be further subdivided by the use of 4th, 5th, 6th or 7th characters.

The ICD-10-CM code T40.604 might also be used to specify conditions or terms like narcotic poisoning of undetermined intent, overdose of opiate or poisoning by opiate and/or related narcotic.

Unspecified diagnosis codes like T40.604 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

ICD-10:T40.604
Short Description:Poisoning by unspecified narcotics, undetermined
Long Description:Poisoning by unspecified narcotics, undetermined

Code Classification

Specific Coding for Poisoning by unspecified narcotics, undetermined

Header codes like T40.604 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10 codes with a higher level of specificity when coding for poisoning by unspecified narcotics, undetermined:

Replaced Code

This code was replaced in the 2021 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, 2020. This code was replaced for the FY 2021 (October 1, 2020 - September 30, 2021).


  • K59.03 - Drug induced constipation

Approximate Synonyms

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

Table of Drugs and Chemicals

The code T40.604 is included in the Table of Drugs and Chemicals, this table contains a classification of drugs, industrial solvents, corrosive gases, noxious plants, pesticides, and other toxic agents. According to ICD-10 coding guidelines it is advised to do not code directly from the Table of Drugs and Chemicals, instead always refer back to the Tabular List when doing the initial coding. Each substance in the table is assigned a code according to the poisoning classification and external causes of adverse effects. It is important to use as many codes as necessary to specify all reported drugs, medicinal or chemical substances. If the same diagnosis code describes the causative agent for more than one adverse reaction, poisoning, toxic effect or underdosing, utilize the code only once.

Substance Poisoning
Accidental
(unintentional)
Poisoning
Accidental
self-harm
Poisoning
Assault
Poisoning
Undetermined
Adverse
effect
Underdosing
Narcotic (drug)T40.601T40.602T40.603T40.604T40.605T40.606
Narcotic (drug)
  »analgesic NEC
T40.601T40.602T40.603T40.604T40.605T40.606
Narcotic (drug)
  »antagonist
T40.601T40.602T40.603T40.604T40.605T40.606
Narcotic (drug)
  »specified NEC
T40.601T40.602T40.603T40.604T40.605T40.606
Narcotic (drug)
  »synthetic
T40.601T40.602T40.603T40.604T40.605T40.606
Opiate NECT40.601T40.602T40.603T40.604T40.605T40.606
Opiate NEC
  »antagonists
T40.601T40.602T40.603T40.604T40.605T40.606

Code History

  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016 (First year ICD-10-CM implemented into the HIPAA code set)