T42.0X6 — Underdosing of hydantoin derivatives
Is T42.0X6 billable?
No — T42.0X6 is a non-billable header code. T42.0X6 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 3 billable codes beneath T42.0X6.
T42.0X6 at a glance
| Code | T42.0X6 |
|---|---|
| Description | Underdosing of hydantoin derivatives |
| 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 T42.0X6 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 T42.0X6. T42.0X6 describes a manifestation and cannot be the principal or first-listed diagnosis.
Use additional code — inherited from Chapter 19
Report an additional code alongside T42.0X6 to fully describe the condition. T42.0X6 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 T42.0X6 to fully describe the condition. T42.0X6 is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T42.0X6, but a patient may have both at the same time. When documentation supports it, T42.0X6 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T42.0X6, but a patient may have both at the same time. When documentation supports it, T42.0X6 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T42
The conditions below are not part of T42.0X6, but a patient may have both at the same time. When documentation supports it, T42.0X6 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 T42.0X6? (3)
How long has T42.0X6 existed?
T42.0X6 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 T42.0X family? (5)
- T42.0X1Poisoning by hydantoin derivatives, accidental (unintentional)not billable
- T42.0X2Poisoning by hydantoin derivatives, intentional self-harmnot billable
- T42.0X3Poisoning by hydantoin derivatives, assaultnot billable
- T42.0X4Poisoning by hydantoin derivatives, undeterminednot billable
- T42.0X5Adverse effect of hydantoin derivativesnot billable