T44.3X4A Poisoning by other parasympatholytics [anticholinergics and antimuscarinics] and spasmolytics, undetermined, initial encounter

ICD-10-CM T44.3X4A: Poisoning by other parasympatholytics and spasmolytics, undetermined, initial encounter

ICD-10-CM code T44.3X4A denotes poisoning by other parasympatholytics, including anticholinergics and antimuscarinics, and spasmolytics where intent is undetermined during an initial encounter. Official terminology sources confirm this exact code description. Public health and billing documents provide context on coding mechanisms and related adverse effect distinctions. 2 5 1 3

Plain-language overview

Code T44.3X4A identifies an instance where a person experiences poisoning from parasympatholytics, such as anticholinergics and antimuscarinics, or spasmolytics, and the intent behind the poisoning is undetermined during an initial encounter. 2

What this code represents

The official display label for T44.3X4A is poisoning by other parasympatholytics and spasmolytics, undetermined, initial encounter, which distinguishes it from adverse effect codes within the same category. 2 4

Coding details

The code T44.3X4A exists within the ICD-10-CM system and is associated with the parent code T44.3X4, which covers poisoning by these specific drugs with an undetermined intent. 6

The seventh character A in T44.3X4A specifies an initial encounter, whereas the character D specifies a subsequent encounter, and S specifies a sequela for the same undetermined intent poisoning. 5 6

Documentation considerations

Federal mandates exist for collecting external cause of injury codes when an injury or poisoning is unknown, and coding mechanisms differentiate between intentional self-harm and undetermined intent. 1

What the sources add

The National Health Statistics Reports source lists T44.3x2 for intentional self-harm poisoning by these same drugs, providing operational context for how intent variations affect code selection compared to the undetermined intent of T44.3X4A. 1 2

Centers for Medicare and Medicaid Services billing articles mention an adverse effect of other parasympatholytics and spasmolytics initial encounter code, contrasting the adverse effect classification with the poisoning classification of T44.3X4A. 3 4

Coverage and utilization context

Centers for Medicare and Medicaid Services articles include references to parasympatholytics and spasmolytics codes within billing and coding publications for services like transthoracic echocardiography and serum magnesium. 3 4

Sources

1. National Health Statistics Reports — cdc.gov; accessed 2026-07-25.
2. EVS Explore — evsexplore.semantics.cancer.gov; accessed 2026-07-25.
3. Article - Billing and Coding: Transthoracic Echocardiography (TTE) (A57306) — cms.gov; accessed 2026-07-25.
4. Article - Billing and Coding: Serum Magnesium (A57198) — cms.gov; accessed 2026-07-25.
5. Browse Code Systems — vsac.nlm.nih.gov; accessed 2026-07-25.
6. Browse Code Systems — vsac.nlm.nih.gov; accessed 2026-07-25.