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  6. 2024 ICD-10-CM Code T40.49
Version 2024
Non-Billable Code

2024 ICD-10-CM Diagnosis Code T40.49

Poisoning by, adverse effect of and underdosing of other synthetic narcotics

ICD-10-CM Code:
T40.49
ICD-10 Code for:
Other synthetic narcotics
Is Billable?
Not Valid for Submission
Code Navigator:

Code Classification

  • Injury, poisoning and certain other consequences of external causes
    (S00–T88)
    • Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances
      (T36-T50)
      • Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]
        (T40)

T40.49 is a non-specific and non-billable diagnosis code code, consider using a code with a higher level of specificity for a diagnosis of poisoning by, adverse effect of and underdosing of other synthetic narcotics. The code is not specific and is NOT valid for the year 2024 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.

Specific Coding Applicable to Other synthetic narcotics

Non-specific codes like T40.49 require more digits to indicate the appropriate level of specificity. Consider using any of the following ICD-10-CM codes with a higher level of specificity when coding for other synthetic narcotics:

  • T40.491 for Poisoning by other synthetic narcotics, accidental (unintentional) - NON-BILLABLE CODE

  • Use T40.491A for initial encounter - BILLABLE CODE

  • Use T40.491D for subsequent encounter - BILLABLE CODE

  • Use T40.491S for sequela - BILLABLE CODE

  • T40.492 for Poisoning by other synthetic narcotics, intentional self-harm - NON-BILLABLE CODE

  • Use T40.492A for initial encounter - BILLABLE CODE

  • Use T40.492D for subsequent encounter - BILLABLE CODE

  • Use T40.492S for sequela - BILLABLE CODE

  • T40.493 for Poisoning by other synthetic narcotics, assault - NON-BILLABLE CODE

  • Use T40.493A for initial encounter - BILLABLE CODE

  • Use T40.493D for subsequent encounter - BILLABLE CODE

  • Use T40.493S for sequela - BILLABLE CODE

  • T40.494 for Poisoning by other synthetic narcotics, undetermined - NON-BILLABLE CODE

  • Use T40.494A for initial encounter - BILLABLE CODE

  • Use T40.494D for subsequent encounter - BILLABLE CODE

  • Use T40.494S for sequela - BILLABLE CODE

  • T40.495 for Adverse effect of other synthetic narcotics - NON-BILLABLE CODE

  • Use T40.495A for initial encounter - BILLABLE CODE

  • Use T40.495D for subsequent encounter - BILLABLE CODE

  • Use T40.495S for sequela - BILLABLE CODE

  • T40.496 for Underdosing of other synthetic narcotics - NON-BILLABLE CODE

  • Use T40.496A for initial encounter - BILLABLE CODE

  • Use T40.496D for subsequent encounter - BILLABLE CODE

  • Use T40.496S for sequela - BILLABLE CODE

Coding Guidelines

When coding a poisoning or reaction to the improper use of a medication (e.g., overdose, wrong substance given or taken in error, wrong route of administration), first assign the appropriate code from categories T36-T50. The poisoning codes have an associated intent as their 5th or 6th character (accidental, intentional self-harm, assault and undetermined. If the intent of the poisoning is unknown or unspecified, code the intent as accidental intent. The undetermined intent is only for use if the documentation in the record specifies that the intent cannot be determined. Use additional code(s) for all manifestations of poisonings.

The appropriate 7th character is to be added to each code from block Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens] (T40). Use the following options for the aplicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Code History

  • FY 2024 - No Change, effective from 10/1/2023 through 9/30/2024
  • FY 2023 - No Change, effective from 10/1/2022 through 9/30/2023
  • FY 2022 - No Change, effective from 10/1/2021 through 9/30/2022
  • FY 2021 - No Change, effective from 10/1/2020 through 9/30/2021