T56.811 (Toxic effect of thallium, accidental (unintentional)) compared with T56.814 (Toxic effect of thallium, undetermined), from the official CMS tabular data. T56.811 and T56.814 code the same substance (ThalliumNEC) with a different intent. MedCoder-derived
Same substance, different circumstance of exposure.
Same substance — undetermined intent (ThalliumNEC)
Accidental poisoning, intentional self-harm, assault, undetermined intent, adverse effect and underdosing are mutually exclusive columns — exactly one applies to a given encounter.
Source: CMS Table of Drugs and Chemicals
Same substance, different intent. T56.811 and T56.814 code the same substance (ThalliumNEC) with a different circumstance of exposure.
From the CMS/CDC Table of Drugs and Chemicals: accidental poisoning, intentional self-harm, assault, undetermined intent, adverse effect and underdosing are mutually exclusive columns — only one of them applies to a given encounter.
| T56.811Toxic effect of thallium, accidental (unintentional) | T56.814Toxic effect of thallium, undetermined | |
|---|---|---|
| Billing status | Non-billable header | Non-billable header |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) |
| Definition | Toxic effect of thallium, accidental (unintentional) is a non-billable ICD-10-CM category code (T56.811). | Toxic effect of thallium, undetermined is a non-billable ICD-10-CM category code (T56.814). |
| 7th character | The appropriate 7th character is to be added to each code from category T56 | The appropriate 7th character is to be added to each code from category T56 |
| Includes | toxic effects of fumes and vapors of metals toxic effects of metals from all sources, except medicinal substances Toxic effect of thallium NOS | 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-) code(s): for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70) | code to identify any retained metal foreign body, if applicable (Z18.0-, T18.1-) code(s): for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources