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ICD-10-CM 2027 diagnosis code

T56.823SToxic effect of gadolinium, assault, sequela

✓ Billable / specificPOA exemptRequires 7th character

T56.823S is a valid, billable ICD-10-CM code for toxic effect of gadolinium, assault, sequela. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

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 T56.823S

T56.823S is the ICD-10-CM diagnosis code for toxic effect of gadolinium, assault, sequela. 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 billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

The 7th character "S" means sequela: use it for complications or conditions that arise as a direct result of the original condition.

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

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 922 (Other Injury, Poisoning and Toxic Effect Diagnoses with MCC, relative weight 1.6238) and DRG 923 (Other Injury, Poisoning and Toxic Effect Diagnoses without MCC, relative weight 0.9973), in MDC 21 (Injuries, Poisonings and Toxic Effects of Drugs), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

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

7th character

Ssequela

Other encounter types for T56.823:

Notes that apply from higher levels

Instructions written at a parent level also apply to T56.823S.

› 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.

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

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 T56.823S

Is T56.823S billable?

Yes. T56.823S is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

What does the "S" at the end of T56.823S mean?

It is the 7th character for sequela. Per the official guidelines, use it for complications or conditions that arise as a direct result of the original condition.

Can T56.823S be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict T56.823S as a principal diagnosis.

Is T56.823S a CC or MCC?

No. T56.823S is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does T56.823S group to?

T56.823S is used in the MS-DRG v44.0 logic for MS-DRG 922 (Other Injury, Poisoning and Toxic Effect Diagnoses with MCC) and MS-DRG 923 (Other Injury, Poisoning and Toxic Effect Diagnoses without MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.