T44.1X1 vs T44.1X6

T44.1X1 (Poisoning by other parasympathomimetics [cholinergics], accidental (unintentional)) compared with T44.1X6 (Underdosing of other parasympathomimetics [cholinergics]), from the official CMS tabular data. T44.1X1 and T44.1X6 code the same substance (Aceclidine) with a different intent.

Relationship

Informational

Drug table relationship

T44.1X1

Poisoning by other parasympathomimetics [cholinergics], accidental (unintentional)

↔

T44.1X6

Underdosing of other parasympathomimetics [cholinergics]

Same substance, different circumstance of exposure.

Same substance — underdosing (Aceclidine)

Accidental poisoning, intentional self-harm, assault, undetermined intent, adverse effect and underdosing are mutually exclusive columns — exactly one applies to a given encounter.

Source: CMS Table of Drugs and Chemicals

Can these codes be reported together?

Same substance, different intent. T44.1X1 and T44.1X6 code the same substance (Aceclidine) with a different circumstance of exposure.

From the CMS Table of Drugs and Chemicals: accidental poisoning, intentional self-harm, assault, undetermined intent, adverse effect and underdosing are mutually exclusive columns — only one of them applies to a given encounter.

Side by side

	T44.1X1Poisoning by other parasympathomimetics [cholinergics], accidental (unintentional)	T44.1X6Underdosing of other parasympathomimetics [cholinergics]
Billing status	Non-billable header	Non-billable header
Classification	S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)	S00-T88 — Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88)
Definition	Poisoning by other parasympathomimetics [cholinergics], accidental (unintentional) is a non-billable ICD-10-CM category code (T44.1X1).	Underdosing of other parasympathomimetics [cholinergics] is a non-billable ICD-10-CM category code (T44.1X6).
7th character	The appropriate 7th character is to be added to each code from category T44	The appropriate 7th character is to be added to each code from category T44
Includes	adverse effect of correct substance properly administered poisoning by overdose of substance poisoning by wrong substance given or taken in error underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed	adverse effect of correct substance properly administered poisoning by overdose of substance poisoning by wrong substance given or taken in error underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed
Use additional code	code(s) to specify: manifestations of poisoning underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)	code(s) to specify: manifestations of poisoning underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
Code first	, for adverse effects, the nature of the adverse effect, such as: adverse effect NOS (T88.7)	, for adverse effects, the nature of the adverse effect, such as: adverse effect NOS (T88.7)

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Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources