T51 vs Z77.40
T51 (Toxic effect of alcohol) compared with Z77.40 (Contact with and (suspected) exposure to unspecified blast overpressure), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. T51 carries an Excludes1 note covering Z77.40: “contact with and (suspected) exposure to toxic substances (Z77.-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Yes, when both are documented. Z77.40 carries an Excludes2 note covering T51: “toxic effects of substances chiefly nonmedicinal as to source (T51-T65)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| T51Toxic effect of alcohol | Z77.40Contact with and (suspected) exposure to unspecified blast overpressure | |
|---|---|---|
| Billing status | Non-billable header Report instead: T51.0X1A, T51.0X1D, T51.0X1S, T51.0X2A, T51.0X2D | Billable |
| Classification | S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) |
| Definition | Toxic effect of alcohol is a non-billable ICD-10-CM category code (T51). | — |
| 7th character | The appropriate 7th character is to be added to each code from category T51 | — |
| Includes | — | contact with and (suspected) exposures to potential hazards to health Contact with and (suspected) exposure to blast overpressure NOS |
| Use additional code | code(s): for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70) personal history of foreign body fully removed (Z87.821) | — |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources