T42 — Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs
Not billable
Is T42 billable?
No — T42 is a non-billable header code. T42 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 60 billable codes beneath T42.
Billable codes under this header
- T42.71XAPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, accidental (unintentional), initial encounter
- T42.71XDPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, accidental (unintentional), subsequent encounter
- T42.71XSPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, accidental (unintentional), sequela
- T42.72XAPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm, initial encounter
- T42.72XDPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm, subsequent encounter
- T42.72XSPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, intentional self-harm, sequela
- T42.73XAPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault, initial encounter
- T42.73XDPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault, subsequent encounter
- T42.73XSPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, assault, sequela
- T42.74XAPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined, initial encounter
- T42.74XDPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined, subsequent encounter
- T42.74XSPoisoning by unspecified antiepileptic and sedative-hypnotic drugs, undetermined, sequela
- T42.75XAAdverse effect of unspecified antiepileptic and sedative-hypnotic drugs, initial encounter
- T42.75XDAdverse effect of unspecified antiepileptic and sedative-hypnotic drugs, subsequent encounter
- T42.75XSAdverse effect of unspecified antiepileptic and sedative-hypnotic drugs, sequela
- T42.76XAUnderdosing of unspecified antiepileptic and sedative-hypnotic drugs, initial encounter
- T42.76XDUnderdosing of unspecified antiepileptic and sedative-hypnotic drugs, subsequent encounter
- T42.76XSUnderdosing of unspecified antiepileptic and sedative-hypnotic drugs, sequela
- T42.0X1APoisoning by hydantoin derivatives, accidental (unintentional), initial encounter
- T42.0X1DPoisoning by hydantoin derivatives, accidental (unintentional), subsequent encounter
- T42.0X1SPoisoning by hydantoin derivatives, accidental (unintentional), sequela
- T42.0X2APoisoning by hydantoin derivatives, intentional self-harm, initial encounter
- T42.0X2DPoisoning by hydantoin derivatives, intentional self-harm, subsequent encounter
- T42.0X2SPoisoning by hydantoin derivatives, intentional self-harm, sequela
- T42.0X3APoisoning by hydantoin derivatives, assault, initial encounter
- T42.0X3DPoisoning by hydantoin derivatives, assault, subsequent encounter
- T42.0X3SPoisoning by hydantoin derivatives, assault, sequela
- T42.0X4APoisoning by hydantoin derivatives, undetermined, initial encounter
- T42.0X4DPoisoning by hydantoin derivatives, undetermined, subsequent encounter
- T42.0X4SPoisoning by hydantoin derivatives, undetermined, sequela
- T42.0X5AAdverse effect of hydantoin derivatives, initial encounter
- T42.0X5DAdverse effect of hydantoin derivatives, subsequent encounter
- T42.0X5SAdverse effect of hydantoin derivatives, sequela
- T42.0X6AUnderdosing of hydantoin derivatives, initial encounter
- T42.0X6DUnderdosing of hydantoin derivatives, subsequent encounter
- T42.0X6SUnderdosing of hydantoin derivatives, sequela
- T42.1X1APoisoning by iminostilbenes, accidental (unintentional), initial encounter
- T42.1X1DPoisoning by iminostilbenes, accidental (unintentional), subsequent encounter
- T42.1X1SPoisoning by iminostilbenes, accidental (unintentional), sequela
- T42.1X2APoisoning by iminostilbenes, intentional self-harm, initial encounter
- T42.1X2DPoisoning by iminostilbenes, intentional self-harm, subsequent encounter
- T42.1X2SPoisoning by iminostilbenes, intentional self-harm, sequela
- T42.1X3APoisoning by iminostilbenes, assault, initial encounter
- T42.1X3DPoisoning by iminostilbenes, assault, subsequent encounter
- T42.1X3SPoisoning by iminostilbenes, assault, sequela
- T42.1X4APoisoning by iminostilbenes, undetermined, initial encounter
- T42.1X4DPoisoning by iminostilbenes, undetermined, subsequent encounter
- T42.1X4SPoisoning by iminostilbenes, undetermined, sequela
- T42.1X5AAdverse effect of iminostilbenes, initial encounter
- T42.1X5DAdverse effect of iminostilbenes, subsequent encounter
- T42.1X5SAdverse effect of iminostilbenes, sequela
- T42.1X6AUnderdosing of iminostilbenes, initial encounter
- T42.1X6DUnderdosing of iminostilbenes, subsequent encounter
- T42.1X6SUnderdosing of iminostilbenes, sequela
- T42.2X1APoisoning by succinimides and oxazolidinediones, accidental (unintentional), initial encounter
- T42.2X1DPoisoning by succinimides and oxazolidinediones, accidental (unintentional), subsequent encounter
- T42.2X1SPoisoning by succinimides and oxazolidinediones, accidental (unintentional), sequela
- T42.2X2APoisoning by succinimides and oxazolidinediones, intentional self-harm, initial encounter
- T42.2X2DPoisoning by succinimides and oxazolidinediones, intentional self-harm, subsequent encounter
- T42.2X2SPoisoning by succinimides and oxazolidinediones, intentional self-harm, sequela
T42 at a glance
| Code | T42 |
|---|---|
| Description | Poisoning by, adverse effect of and underdosing of antiepileptic, sedative- hypnotic and antiparkinsonism drugs |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Excludes2 — not included here
The conditions below are not part of T42, but a patient may have both at the same time. When documentation supports it, T42 and the excluded code may both be reported.
- drug dependence and related mental and behavioral disorders due to psychoactive substance use (F10.--F19.-)
Excludes1 — never code together — inherited from T36-T50
The conditions below can never be reported together with T42 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. T42 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 to fully describe the condition. T42 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 to fully describe the condition. T42 is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T42, but a patient may have both at the same time. When documentation supports it, T42 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T42, but a patient may have both at the same time. When documentation supports it, T42 and the excluded code may both be reported.
What codes fall under T42? (9)
- 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
- T42.4Poisoning by, adverse effect of and underdosing of benzodiazepinesnot 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
How long has T42 existed?
T42 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.