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  6. 2024 ICD-10-CM Code T40.41
Version 2024
Non-Billable Code

2024 ICD-10-CM Diagnosis Code T40.41

Poisoning by, adverse effect of and underdosing of fentanyl or fentanyl analogs

ICD-10-CM Code:
T40.41
ICD-10 Code for:
Fentanyl or fentanyl analogs
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)

T40.41 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 fentanyl or fentanyl analogs. 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 Fentanyl or fentanyl analogs

Non-specific codes like T40.41 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 fentanyl or fentanyl analogs:

  • T40.411 for Poisoning by fentanyl or fentanyl analogs, accidental (unintentional) - NON-BILLABLE CODE

  • Use T40.411A for initial encounter - BILLABLE CODE

  • Use T40.411D for subsequent encounter - BILLABLE CODE

  • Use T40.411S for sequela - BILLABLE CODE

  • T40.412 for Poisoning by fentanyl or fentanyl analogs, intentional self-harm - NON-BILLABLE CODE

  • Use T40.412A for initial encounter - BILLABLE CODE

  • Use T40.412D for subsequent encounter - BILLABLE CODE

  • Use T40.412S for sequela - BILLABLE CODE

  • T40.413 for Poisoning by fentanyl or fentanyl analogs, assault - NON-BILLABLE CODE

  • Use T40.413A for initial encounter - BILLABLE CODE

  • Use T40.413D for subsequent encounter - BILLABLE CODE

  • Use T40.413S for sequela - BILLABLE CODE

  • T40.414 for Poisoning by fentanyl or fentanyl analogs, undetermined - NON-BILLABLE CODE

  • Use T40.414A for initial encounter - BILLABLE CODE

  • Use T40.414D for subsequent encounter - BILLABLE CODE

  • Use T40.414S for sequela - BILLABLE CODE

  • T40.415 for Adverse effect of fentanyl or fentanyl analogs - NON-BILLABLE CODE

  • Use T40.415A for initial encounter - BILLABLE CODE

  • Use T40.415D for subsequent encounter - BILLABLE CODE

  • Use T40.415S for sequela - BILLABLE CODE

  • T40.416 for Underdosing of fentanyl or fentanyl analogs - NON-BILLABLE CODE

  • Use T40.416A for initial encounter - BILLABLE CODE

  • Use T40.416D for subsequent encounter - BILLABLE CODE

  • Use T40.416S 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