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ICD-10-CM 2027 diagnosis code

T56.821Toxic effect of gadolinium, accidental (unintentional)

Not billable — use a more specific codeRequires 7th character

T56.821 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 FY2024 (effective October 1, 2023). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About T56.821

T56.821 is the ICD-10-CM diagnosis code for toxic effect of gadolinium, accidental (unintentional). It belongs to category T56 (toxic effect of metals), 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 T56.82 (toxic effect of gadolinium), T56.821 is specifically for toxic effect of gadolinium, accidental (unintentional). Related codes cover intentional self-harm (T56.822), assault (T56.823) and undetermined (T56.824).

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.

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

It was added in FY2024, effective October 1, 2023.

7th character

The appropriate 7th character is to be added to each code from category T56

Coding notes

Applicable toConditions and synonyms classified to this code
  • Toxic effect of gadolinium NOS

Notes that apply from higher levels

Instructions written at a parent level also apply to T56.821.

› From T56.82 Toxic effect of gadolinium
Excludes1
  • adverse effect of diagnostic agents (T50.8X5-)
› From T56 Toxic effect of metals
Includes
  • toxic effects of fumes and vapors of metals
  • toxic effects of metals from all sources, except medicinal substances
Excludes1
  • arsenic and its compounds (T57.0)
  • manganese and its compounds (T57.2)
Use additional code
  • code to identify any retained metal foreign body, if applicable (Z18.0-, T18.1-)

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

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
  • FY2024 (effective 10/1/2023): Added
  • No changes since FY2024.

Common questions about T56.821

Is T56.821 billable?

No. T56.821 is a header code. Report one of its more specific subcodes instead.