T44.991 — Poisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional)
Is T44.991 billable?
No — T44.991 is a non-billable header code. T44.991 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 T44.991.
Billable codes under this header
- T44.991APoisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional), initial encounter
- T44.991DPoisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional), subsequent encounter
- T44.991SPoisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional), sequela
T44.991 at a glance
| Code | T44.991 |
|---|---|
| Description | Poisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional) |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Inclusion terms
Alternative wording in documentation that is classified to T44.991.
- Poisoning by other drugs primarily affecting the autonomic nervous system NOS
Excludes1 — never code together — inherited from T36-T50
The conditions below can never be reported together with T44.991 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 T44.991. T44.991 describes a manifestation and cannot be the principal or first-listed diagnosis.
Use additional code — inherited from Chapter 19
Report an additional code alongside T44.991 to fully describe the condition. T44.991 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 T44.991 to fully describe the condition. T44.991 is sequenced first.
Excludes2 — not included here — inherited from Chapter 19
The conditions below are not part of T44.991, but a patient may have both at the same time. When documentation supports it, T44.991 and the excluded code may both be reported.
Excludes2 — not included here — inherited from T36-T50
The conditions below are not part of T44.991, but a patient may have both at the same time. When documentation supports it, T44.991 and the excluded code may both be reported.
What codes fall under T44.991? (3)
- T44.991APoisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional), initial encounter
- T44.991DPoisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional), subsequent encounter
- T44.991SPoisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional), sequela
How long has T44.991 existed?
T44.991 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 T44.99 family? (5)
- T44.992Poisoning by other drug primarily affecting the autonomic nervous system, intentional self-harmnot billable
- T44.993Poisoning by other drug primarily affecting the autonomic nervous system, assaultnot billable
- T44.994Poisoning by other drug primarily affecting the autonomic nervous system, undeterminednot billable
- T44.995Adverse effect of other drug primarily affecting the autonomic nervous systemnot billable
- T44.996Underdosing of other drug primarily affecting the autonomic nervous systemnot billable