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ICD-10-CM 2027 diagnosis code

T40.423Poisoning by tramadol, assault

Not billable — use a more specific codeRequires 7th character

T40.423 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it and add the required 7th character.

Code last changed in FY2021 (effective October 1, 2020). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About T40.423

T40.423 is the ICD-10-CM diagnosis code for poisoning by tramadol, assault. It belongs to category T40 (poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens]), block 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). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

Within T40.42 (poisoning by, adverse effect of and underdosing of tramadol), T40.423 is specifically for poisoning by tramadol, assault. Related codes cover poisoning by tramadol, accidental (unintentional) (T40.421), poisoning by tramadol, intentional self-harm (T40.422), poisoning by tramadol, undetermined (T40.424), adverse effect of tramadol (T40.425) and underdosing of tramadol (T40.426).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It was added in FY2021, effective 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 T40.423.

› 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.

Table of Drugs & Neoplasms entries

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
  • FY2021 (effective 10/1/2020): Added
  • No changes since FY2021.

Common questions about T40.423

Is T40.423 billable?

No. T40.423 is a header code. Report one of its more specific subcodes instead.