T52.1 vs T52.2
T52.1 (Toxic effects of benzene) compared with T52.2 (Toxic effects of homologues of benzene), 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. T52.1 carries an Excludes1 note covering T52.2: “homologues of benzene (T52.2)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| T52.1Toxic effects of benzene | T52.2Toxic effects of homologues of benzene | |
|---|---|---|
| Billing status | Non-billable header Report instead: T52.1X1A, T52.1X1D, T52.1X1S, T52.1X2A, T52.1X2D | Non-billable header Report instead: T52.2X1A, T52.2X1D, T52.2X1S, T52.2X2A, T52.2X2D |
| 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 effects of benzene is a non-billable ICD-10-CM category code (T52.1). | Toxic effects of homologues of benzene is a non-billable ICD-10-CM category code (T52.2). |
| 7th character | The appropriate 7th character is to be added to each code from category T52 | The appropriate 7th character is to be added to each code from category T52 |
| Includes | — | Toxic effects of toluene [methylbenzene] Toxic effects of xylene [dimethylbenzene] |
| 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) | 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