T40.496 — Underdosing of other synthetic narcotics
Is T40.496 billable?
No — T40.496 is a non-billable header code. T40.496 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 T40.496.
T40.496 at a glance
| Code | T40.496 |
|---|---|
| Description | Underdosing of other synthetic narcotics |
| 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 T40.496 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 T40.496. T40.496 describes a manifestation and cannot be the principal or first-listed diagnosis.
Use additional code — inherited from Chapter 19
Report an additional code alongside T40.496 to fully describe the condition. T40.496 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 T40.496 to fully describe the condition. T40.496 is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T40.496, but a patient may have both at the same time. When documentation supports it, T40.496 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T40.496, but a patient may have both at the same time. When documentation supports it, T40.496 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T40
The conditions below are not part of T40.496, but a patient may have both at the same time. When documentation supports it, T40.496 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 T40.496? (3)
How long has T40.496 existed?
T40.496 first appears in FY2021 (FY2020 is not available, so it may have appeared then).
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 T40.49 family? (5)
- T40.491Poisoning by other synthetic narcotics, accidental (unintentional)not billable
- T40.492Poisoning by other synthetic narcotics, intentional self-harmnot billable
- T40.493Poisoning by other synthetic narcotics, assaultnot billable
- T40.494Poisoning by other synthetic narcotics, undeterminednot billable
- T40.495Adverse effect of other synthetic narcoticsnot billable