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ICD-10-CM 2027 diagnosis code

T40.4X4Poisoning by other synthetic narcotics, undetermined

Deleted in FY2021Requires 7th character

T40.4X4 was removed from ICD-10-CM in FY2021 and can't be reported for dates of service on or after October 1, 2020. See the more specific codes below.

Code last changed in FY2016 (effective October 1, 2015). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About T40.4X4

T40.4X4 was the ICD-10-CM code for poisoning by other synthetic narcotics, undetermined until it was deleted in FY2021. It can't be reported for dates of service on or after October 1, 2020.

7th character

The appropriate 7th character is to be added to each code from category T40

Notes that apply from higher levels

Instructions written at a parent level also apply to T40.4X4.

› From T40 Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]
Excludes2
  • drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.-F19.-)

Broader instructions also apply from T36-T50 Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • FY2021 (effective 10/1/2020): Deleted

Common questions about T40.4X4

Is T40.4X4 billable?

No. T40.4X4 was deleted in FY2021.