T49.4X4A vs T49.4X4S
T49.4X4A (Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined, initial encounter) compared with T49.4X4S (Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined, sequela), from the official CMS tabular data. T49.4X4A and T49.4X4S code the same injury at a different phase of treatment.
Can these codes be reported together?
Same injury, other encounter phase. T49.4X4A and T49.4X4S 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
| T49.4X4APoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined, initial encounter | T49.4X4SPoisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined, sequela | |
|---|---|---|
| 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 | Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined, initial encounter is a billable ICD-10-CM diagnosis code (T49.4X4A). | Poisoning by keratolytics, keratoplastics, and other hair treatment drugs and preparations, undetermined, sequela is a billable ICD-10-CM diagnosis code (T49.4X4S). |
| 7th character | The appropriate 7th character is to be added to each code from category T49 | The appropriate 7th character is to be added to each code from category T49 |
| Includes | poisoning by, adverse effect of and underdosing of glucocorticoids, topically used adverse effect of correct substance properly administered poisoning by overdose of substance poisoning by wrong substance given or taken in error | poisoning by, adverse effect of and underdosing of glucocorticoids, topically used adverse effect of correct substance properly administered poisoning by overdose of substance poisoning by wrong substance given or taken in error |
| Use additional code | code(s) to specify: manifestations of poisoning underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9) | code(s) to specify: manifestations of poisoning underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9) |
| Code first | , for adverse effects, the nature of the adverse effect, such as: adverse effect NOS (T88.7) | , for adverse effects, the nature of the adverse effect, such as: adverse effect NOS (T88.7) |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources