T42.5X4
Poisoning by mixed antiepileptics, undetermined
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 3 never code together
T42code
Excludes2 — not included here, but the patient may have both. Code both when documented.
7th character 3
A initial encounter
D subsequent encounter
S sequela
Instructional notes 3
S00-T88chapter
Notes
- Use secondary code(s) from Chapter 20, External causes of morbidity, to indicate cause of injury. Codes within the T section that include the external cause do not require an additional external cause code
- The chapter uses the S-section for coding different types of injuries related to single body regions and the T-section to cover injuries to unspecified body regions as well as poisoning and certain other consequences of external causes.
Use additional code
- code to identify any retained foreign body, if applicable (Z18.-)Z18.-
Index entries leading here 1 filed at T42.5
The index files this at T42.5. The tabular
extends it — laterality, staging, or the 7th character — so these entries
lead to the family rather than to T42.5X4 exactly.
- Adverse effect — see Table of Drugs and Chemicals, categories T36-T50, with 6th character 5
Alongside this code 5 same parent — T42.5X
T42.5X1 Poisoning by mixed antiepileptics, accidental category T42.5X2 Poisoning by mixed antiepileptics, intentional self-harm category T42.5X3 Poisoning by mixed antiepileptics, assault category T42.5X5 Adverse effect of mixed antiepileptics category T42.5X6 Underdosing of mixed antiepileptics category
Subordinate codes 3
Additional references
AHA Coding Clinic® Licence required
Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.