T40.3X — Poisoning by, adverse effect of and underdosing of methadone
Is T40.3X billable?
No — T40.3X is a non-billable header code. T40.3X 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 T40.3X.
Billable codes under this header
- T40.3X1APoisoning by methadone, accidental (unintentional), initial encounter
- T40.3X1DPoisoning by methadone, accidental (unintentional), subsequent encounter
- T40.3X1SPoisoning by methadone, accidental (unintentional), sequela
- T40.3X2APoisoning by methadone, intentional self-harm, initial encounter
- T40.3X2DPoisoning by methadone, intentional self-harm, subsequent encounter
- T40.3X2SPoisoning by methadone, intentional self-harm, sequela
- T40.3X3APoisoning by methadone, assault, initial encounter
- T40.3X3DPoisoning by methadone, assault, subsequent encounter
- T40.3X3SPoisoning by methadone, assault, sequela
- T40.3X4APoisoning by methadone, undetermined, initial encounter
- T40.3X4DPoisoning by methadone, undetermined, subsequent encounter
- T40.3X4SPoisoning by methadone, undetermined, sequela
- T40.3X5AAdverse effect of methadone, initial encounter
- T40.3X5DAdverse effect of methadone, subsequent encounter
- T40.3X5SAdverse effect of methadone, sequela
- T40.3X6AUnderdosing of methadone, initial encounter
- T40.3X6DUnderdosing of methadone, subsequent encounter
- T40.3X6SUnderdosing of methadone, sequela
T40.3X at a glance
| Code | T40.3X |
|---|---|
| Description | Poisoning by, adverse effect of and underdosing of methadone |
| 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 T40.3X 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 T40.3X. T40.3X describes a manifestation and cannot be the principal or first-listed diagnosis.
Use additional code — inherited from Chapter 19
Report an additional code alongside T40.3X to fully describe the condition. T40.3X 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 T40.3X to fully describe the condition. T40.3X is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T40.3X, but a patient may have both at the same time. When documentation supports it, T40.3X and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T40.3X, but a patient may have both at the same time. When documentation supports it, T40.3X and the excluded code may both be reported.
Excludes2 — not included here — inherited from T40
The conditions below are not part of T40.3X, but a patient may have both at the same time. When documentation supports it, T40.3X 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 T40.3X? (6)
- T40.3X1Poisoning by methadone, accidental (unintentional)not billable
- T40.3X2Poisoning by methadone, intentional self-harmnot billable
- T40.3X3Poisoning by methadone, assaultnot billable
- T40.3X4Poisoning by methadone, undeterminednot billable
- T40.3X5Adverse effect of methadonenot billable
- T40.3X6Underdosing of methadonenot billable
How long has T40.3X existed?
T40.3X 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.