T56.1X2A vs T56.1X2D
T56.1X2A (Toxic effect of mercury and its compounds, intentional self-harm, initial encounter) compared with T56.1X2D (Toxic effect of mercury and its compounds, intentional self-harm, subsequent encounter), from the official CMS tabular data. T56.1X2A and T56.1X2D code the same injury at a different phase of treatment.
Can these codes be reported together?
Same injury, other encounter phase. T56.1X2A and T56.1X2D code the same injury at a different phase of treatment, set by the 7th character.
The 7th character records the type of care given at the encounter being coded (ICD-10-CM Official Guidelines, Section I.C.19.a), so one encounter takes one of these, not both.
Side by side
| T56.1X2AToxic effect of mercury and its compounds, intentional self-harm, initial encounter | T56.1X2DToxic effect of mercury and its compounds, intentional self-harm, subsequent encounter | |
|---|---|---|
| Billing status | Billable | Billable |
| 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 mercury and its compounds, intentional self-harm, initial encounter is a billable ICD-10-CM diagnosis code (T56.1X2A). | Toxic effect of mercury and its compounds, intentional self-harm, subsequent encounter is a billable ICD-10-CM diagnosis code (T56.1X2D). |
| 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 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