T54.2X4A vs T54.2X4D
T54.2X4A (Toxic effect of corrosive acids and acid-like substances, undetermined, initial encounter) compared with T54.2X4D (Toxic effect of corrosive acids and acid-like substances, undetermined, subsequent encounter), from the official CMS tabular data. T54.2X4A and T54.2X4D code the same injury at a different phase of treatment.
Can these codes be reported together?
Same injury, other encounter phase. T54.2X4A and T54.2X4D 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
| T54.2X4AToxic effect of corrosive acids and acid-like substances, undetermined, initial encounter | T54.2X4DToxic effect of corrosive acids and acid-like substances, undetermined, 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 corrosive acids and acid-like substances, undetermined, initial encounter is a billable ICD-10-CM diagnosis code (T54.2X4A). | Toxic effect of corrosive acids and acid-like substances, undetermined, subsequent encounter is a billable ICD-10-CM diagnosis code (T54.2X4D). |
| 7th character | The appropriate 7th character is to be added to each code from category T54 | The appropriate 7th character is to be added to each code from category T54 |
| 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