2026 ICD-10-CM Diagnosis Code T56Toxic effect of metals

ICD-10-CM Codes›S00–T88›T51-T65›T56

ICD-10-CM T56
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T56 is a non-billable ICD-10-CM category code for toxic effect of metals, so it cannot be submitted on claims. Use a more specific code from this category instead, such as T56.0X1A, T56.0X1D, T56.0X1S, and T56.0X2A.

Code Identity

ICD-10-CM Code
T56
Billable Status
No — Non-Billable Category
Code Describes
Toxic effect of metals
Chapter
T51-T65
Toxic effects of substances chiefly nonmedicinal as to source

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT51-T65Toxic effects of substances chiefly nonmedicinal as to source
CategoryT56Toxic effect of metals
This CodeT56Toxic effect of metals

Specific Coding for Toxic effect of metalsOverview

Non-specific codes like T56 require more characters. Use one of these billable codes instead:

  • T56.0 for Toxic effects of lead and its compounds

  • T56.0X for Toxic effects of lead and its compounds

  • T56.1 for Toxic effects of mercury and its compounds

  • T56.1X for Toxic effects of mercury and its compounds

  • T56.2 for Toxic effects of chromium and its compounds

  • T56.2X for Toxic effects of chromium and its compounds

  • T56.3 for Toxic effects of cadmium and its compounds

  • T56.3X for Toxic effects of cadmium and its compounds

  • T56.4 for Toxic effects of copper and its compounds

  • T56.4X for Toxic effects of copper and its compounds

  • T56.5 for Toxic effects of zinc and its compounds

  • T56.5X for Toxic effects of zinc and its compounds

  • T56.6 for Toxic effects of tin and its compounds

  • T56.6X for Toxic effects of tin and its compounds

  • T56.7 for Toxic effects of beryllium and its compounds

  • T56.7X for Toxic effects of beryllium and its compounds

  • T56.8 for Toxic effects of other metals

  • T56.81 for Toxic effect of thallium

  • T56.82 for Toxic effect of gadolinium

  • T56.89 for Toxic effects of other metals

  • T56.9 for Toxic effects of unspecified metal

  • T56.91 for Toxic effect of unspecified metal, accidental (unintentional)

  • T56.92 for Toxic effect of unspecified metal, intentional self-harm

  • T56.93 for Toxic effect of unspecified metal, assault

  • T56.94 for Toxic effect of unspecified metal, undetermined

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Toxic effect of metals (T56). Use the following options for the applicable episode of care:

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Includes

  • toxic effects of fumes and vapors of metals
  • toxic effects of metals from all sources, except medicinal substances

Use Additional Code

  • code to identify any retained metal foreign body, if applicable Z18.0 T18.1

Type 1 Excludes

  • arsenic and its compounds T57.0
  • manganese and its compounds T57.2

7th Character Note

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

7th Character

  • A - initial encounter
  • D - subsequent encounter
  • S - sequela

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T56Overview

Is T56 (Toxic effect of metals) a billable code?

No. This is a category header that groups the codes for toxic effect of metals, and headers cannot be submitted on claims. Claims for toxic effect of metals need a more specific code from this category, such as T56.0X1A, T56.0X1D, and T56.0X1S.