T42.6X4
Poisoning by other antiepileptic and sedative-hypnotic drugs, undetermined
Not billable — category only FY2026 2025-10-01 → 2026-09-30
Exclusions 4 never code together
T42code
Excludes1 — never code together. The excluded condition and this one are mutually exclusive.
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 5
T42.6code
Inclusion terms
- Poisoning by, adverse effect of and underdosing of methaqualone
- Poisoning by, adverse effect of and underdosing of valproic acid
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 2 filed at T42.6
Alongside this code 5 same parent — T42.6X
T42.6X1 Poisoning by oth antieplptc and sed-hypntc drugs, acc category T42.6X2 Poisoning by oth antieplptc and sed-hypntc drugs, self-harm category T42.6X3 Poisoning by oth antiepileptic and sed-hypntc drugs, assault category T42.6X5 Adverse effect of antiepileptic and sedative-hypnotic drugs category T42.6X6 Underdosing of oth antiepileptic and sedative-hypnotic drugs 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.