ICD-10-CM 2027 diagnosis code
T65.0X4Toxic effect of cyanides, undetermined
T65.0X4 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 unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About T65.0X4
T65.0X4 is the ICD-10-CM diagnosis code for toxic effect of cyanides, undetermined. It belongs to category T65 (toxic effect of other and unspecified substances), block T51-T65 (toxic effects of substances chiefly nonmedicinal as to source) 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 T65.0X (toxic effect of cyanides), T65.0X4 is specifically for toxic effect of cyanides, undetermined. Related codes cover accidental (unintentional) (T65.0X1), intentional self-harm (T65.0X2) and assault (T65.0X3).
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 has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
7th character
The appropriate 7th character is to be added to each code from category T65
Notes that apply from higher levels
Instructions written at a parent level also apply to T65.0X4.
› From T65.0 Toxic effect of cyanides
- hydrogen cyanide (T57.3-)
Broader instructions also apply from T51-T65 Toxic effects of substances chiefly nonmedicinal as to source and Chapter 19: Injury, poisoning and certain other consequences of external causes.
Table of Drugs & Neoplasms entries
- 2,4-toluene diisocyanate — Poisoning Undetermined
- Aliphatic thiocyanates — Poisoning Undetermined
- Alkylisocyanate — Poisoning Undetermined
- Cyanide (s) (compounds) (potassium) (sodium) NEC — Poisoning Undetermined
- Cyanide (s) (compounds) (potassium) (sodium) NEC › fumigant — Poisoning Undetermined
- Cyanide (s) (compounds) (potassium) (sodium) NEC › pesticide (dust) (fumes) — Poisoning Undetermined
- Dicyanogen (gas) — Poisoning Undetermined
- Gas NEC › dicyanogen — Poisoning Undetermined
- Gas NEC › hydrocyanic acid — Poisoning Undetermined
- Hydrocyanic acid (liquid) › gas — Poisoning Undetermined
- Isocyanate — Poisoning Undetermined
- Pesticide (dust) (fumes) (vapor) NEC › cyanide — Poisoning Undetermined
- Potassium (salts) NEC › cyanide — Poisoning Undetermined
- Prussic acid — Poisoning Undetermined
- Sodium › cyanide — Poisoning Undetermined
- TDI (vapor) — Poisoning Undetermined
- Toluene (liquid) › diisocyanate — Poisoning Undetermined
- Tolylene-2,4-diisocyanate — Poisoning Undetermined
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about T65.0X4
Is T65.0X4 billable?
- No. T65.0X4 is a header code. Report one of its more specific subcodes instead.