ICDcodes.org
FY2027

T40.491 — Poisoning by other synthetic narcotics, accidental (unintentional)

Not billable

Is T40.491 billable?

No — T40.491 is a non-billable header code. T40.491 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 T40.491.

T40.491 at a glance

CodeT40.491
DescriptionPoisoning by other synthetic narcotics, accidental (unintentional)
BillableNo — header code
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Inclusion terms

Alternative wording in documentation that is classified to T40.491.

  • Poisoning by other synthetic narcotics NOS

Excludes1 — never code together — inherited from T36-T50

The conditions below can never be reported together with T40.491 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 T40.491. T40.491 describes a manifestation and cannot be the principal or first-listed diagnosis.

  • , for adverse effects, the nature of the adverse effect, such as:
  • adverse effect NOS (T88.7)
  • aspirin gastritis (K29.-)
  • blood disorders (D56-D76)
  • contact dermatitis (L23-L25)
  • dermatitis due to substances taken internally (L27.-)
  • nephropathy (N14.0-N14.2)

Use additional code — inherited from Chapter 19

Report an additional code alongside T40.491 to fully describe the condition. T40.491 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 T40.491 to fully describe the condition. T40.491 is sequenced first.

  • code(s) to specify:
  • manifestations of poisoning
  • underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
  • underdosing of medication regimen (Z91.12-, Z91.13-)

Excludes2 — not included here — inherited from Chapter 19

The conditions below are not part of T40.491, but a patient may have both at the same time. When documentation supports it, T40.491 and the excluded code may both be reported.

  • birth trauma (P10-P15)
  • obstetric trauma (O70-O71)

Excludes2 — not included here — inherited from T36-T50

The conditions below are not part of T40.491, but a patient may have both at the same time. When documentation supports it, T40.491 and the excluded code may both be reported.

  • abuse and dependence of psychoactive substances (F10-F19)
  • abuse of non-dependence-producing substances (F55.-)
  • immunodeficiency due to drugs (D84.821)
  • drug reaction and poisoning affecting newborn (P00-P96)
  • pathological drug intoxication (inebriation) (F10-F19)

Excludes2 — not included here — inherited from T40

The conditions below are not part of T40.491, but a patient may have both at the same time. When documentation supports it, T40.491 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 T40.491? (3)

How long has T40.491 existed?

T40.491 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)