T42.0X — Poisoning by, adverse effect of and underdosing of hydantoin derivatives
T42.0X is a non-billable header ICD-10-CM code for poisoning by, adverse effect of and underdosing of hydantoin derivatives. It cannot be billed on its own: choose one of the more specific child codes below. This code also requires a 7th character before it is complete.
This code requires a 7th character
The appropriate 7th character is to be added to each code from category T42
- A
- initial encounter
- D
- subsequent encounter
- S
- sequela
Excludes2 inherited from the categories above T42.0X
Also inherited, and the opposite of Excludes1: these conditions are not part of T42.0X, but a patient can have both, so you may code both.
Risk adjustment
T42.0X does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Code history
T42.0X has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Code to one of these instead T42.0X
6 child codes. Green means billable.
- T42.0X1Poisoning by hydantoin derivatives, accidental (unintentional)
- T42.0X2Poisoning by hydantoin derivatives, intentional self-harm
- T42.0X3Poisoning by hydantoin derivatives, assault
- T42.0X4Poisoning by hydantoin derivatives, undetermined
- T42.0X5Adverse effect of hydantoin derivatives
- T42.0X6Underdosing of hydantoin derivatives
Questions about T42.0X
- Is T42.0X a billable ICD-10-CM code?
- No. T42.0X is a non-billable header code. Code to a higher level of specificity using one of its child codes.
- Where does T42.0X sit in the tabular list?
- Injury, poisoning and certain other consequences of external causes (S00-T88), in the block Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances (T36-T50).