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ICD-10-CM 2027 diagnosis code

T56Toxic effect of metals

Not billable — use a more specific code

T56 is a header code, so it can't be reported by itself. Choose one of the 10 more specific codes beneath it.

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 T56

T56 is the ICD-10-CM diagnosis code for toxic effect of metals. It belongs to 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 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: T56.0 (compounds), T56.1 (compounds), T56.2 (compounds), T56.3 (compounds), T56.4 (compounds), T56.5 (compounds), T56.6 (compounds), T56.7 (compounds) and 2 more.

Don't report T56 together with the conditions in its Excludes1 note: arsenic and its compounds (T57.0) and manganese and its compounds (T57.2).

Use an additional code to identify any retained metal foreign body, if applicable (Z18.0-, T18.1-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under T56

Coding notes

IncludesFurther defines the content of the category
  • toxic effects of fumes and vapors of metals
  • toxic effects of metals from all sources, except medicinal substances
Excludes1Not coded here — never report together with this code
  • arsenic and its compounds (T57.0)
  • manganese and its compounds (T57.2)
Use additional codeAdd a secondary code to fully describe the condition
  • code to identify any retained metal foreign body, if applicable (Z18.0-, T18.1-)

Notes that apply from higher levels

Instructions written at a parent level also apply to T56.

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.

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)
  • No changes since FY2016.

Common questions about T56

Is T56 billable?

No. T56 is a header code. Report one of its more specific subcodes instead.