T42.4 — Poisoning by, adverse effect of and underdosing of benzodiazepines
Is T42.4 billable?
No — T42.4 is a non-billable header code. T42.4 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 18 billable codes beneath T42.4.
Billable codes under this header
- T42.4X1APoisoning by benzodiazepines, accidental (unintentional), initial encounter
- T42.4X1DPoisoning by benzodiazepines, accidental (unintentional), subsequent encounter
- T42.4X1SPoisoning by benzodiazepines, accidental (unintentional), sequela
- T42.4X2APoisoning by benzodiazepines, intentional self-harm, initial encounter
- T42.4X2DPoisoning by benzodiazepines, intentional self-harm, subsequent encounter
- T42.4X2SPoisoning by benzodiazepines, intentional self-harm, sequela
- T42.4X3APoisoning by benzodiazepines, assault, initial encounter
- T42.4X3DPoisoning by benzodiazepines, assault, subsequent encounter
- T42.4X3SPoisoning by benzodiazepines, assault, sequela
- T42.4X4APoisoning by benzodiazepines, undetermined, initial encounter
- T42.4X4DPoisoning by benzodiazepines, undetermined, subsequent encounter
- T42.4X4SPoisoning by benzodiazepines, undetermined, sequela
- T42.4X5AAdverse effect of benzodiazepines, initial encounter
- T42.4X5DAdverse effect of benzodiazepines, subsequent encounter
- T42.4X5SAdverse effect of benzodiazepines, sequela
- T42.4X6AUnderdosing of benzodiazepines, initial encounter
- T42.4X6DUnderdosing of benzodiazepines, subsequent encounter
- T42.4X6SUnderdosing of benzodiazepines, sequela
T42.4 at a glance
| Code | T42.4 |
|---|---|
| Description | Poisoning by, adverse effect of and underdosing of benzodiazepines |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes1 — never code together — inherited from T36-T50
The conditions below can never be reported together with T42.4 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- toxic reaction to local anesthesia in pregnancy (O29.3-)
Code first — inherited from T36-T50
The underlying condition below must be sequenced before T42.4. T42.4 describes a manifestation and cannot be the principal or first-listed diagnosis.
Use additional code — inherited from Chapter 19
Report an additional code alongside T42.4 to fully describe the condition. T42.4 is sequenced first.
- code to identify any retained foreign body, if applicable (Z18.-)
Use additional code — inherited from T36-T50
Report an additional code alongside T42.4 to fully describe the condition. T42.4 is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T42.4, but a patient may have both at the same time. When documentation supports it, T42.4 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T42.4, but a patient may have both at the same time. When documentation supports it, T42.4 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T42
The conditions below are not part of T42.4, but a patient may have both at the same time. When documentation supports it, T42.4 and the excluded code may both be reported.
- drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-)
What codes fall under T42.4? (1)
How long has T42.4 existed?
T42.4 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.
What other codes are in the T42 family? (8)
- T42.0Poisoning by, adverse effect of and underdosing of hydantoin derivativesnot billable
- T42.1Poisoning by, adverse effect of and underdosing of iminostilbenesnot billable
- T42.2Poisoning by, adverse effect of and underdosing of succinimides and oxazolidinedionesnot billable
- T42.3Poisoning by, adverse effect of and underdosing of barbituratesnot billable
- T42.5Poisoning by, adverse effect of and underdosing of mixed antiepilepticsnot billable
- T42.6Poisoning by, adverse effect of and underdosing of other antiepileptic and sedative-hypnotic drugsnot billable
- T42.7Poisoning by, adverse effect of and underdosing of unspecified antiepileptic and sedative-hypnotic drugsnot billable
- T42.8Poisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressantsnot billable