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T44.8

⚠ Non-billable (Header)

Poisoning by, adverse effect of and underdosing of centrally-acting and adrenergic-neuron- blocking agents

Injury, poisoning and certain other consequences of external causes (S00-T88)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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⚠️ Excludes2

direct

Both codes can exist if both conditions are documented.

  • • poisoning by, adverse effect of and underdosing of clonidine (T46.5)
  • • poisoning by, adverse effect of and underdosing of guanethidine (T46.5)

Child Codes (1)

T44.8XPoisoning by, adverse effect of and underdosing of centrally-acting and adrenergic- neuron-blocking agents

Clinical Description

ICD-10-CM code T44.8 represents poisoning by, adverse effect of and underdosing of centrally-acting and adrenergic-neuron- blocking agents. This code falls under the Injury, poisoning and certain other consequences of external causes (S00-T88) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.

This is a 5-character code at the 4th level of specificity. There are 1 more specific child codes under T44.8.

Frequently Asked Questions

What is ICD-10 code T44.8?

ICD-10-CM code T44.8 is "Poisoning by, adverse effect of and underdosing of centrally-acting and adrenergic-neuron- blocking agents". It belongs to the category: Injury, poisoning and certain other consequences of external causes (S00-T88).

Is T44.8 a billable ICD-10 code?

No, T44.8 is a non-billable header code. A more specific child code must be used for billing.

Can T44.8 be coded with other codes?

T44.8 has 2 Excludes2 note(s). These conditions can be coded together if both are documented in the patient record.

Related Codes in T44

Other codes in the same category that may be relevant for differential coding:

T44.0Poisoning by, adverse effect of and underdosing of anticholinesterase agentsT44.1Poisoning by, adverse effect of and underdosing of other parasympathomimetics [cholinergics]T44.2Poisoning by, adverse effect of and underdosing of ganglionic blocking drugsT44.3Poisoning by, adverse effect of and underdosing of other parasympatholytics [anticholinergics and antimuscarinics] and spasmolyticsT44.4Poisoning by, adverse effect of and underdosing of predominantly alpha-adrenoreceptor agonistsT44.5Poisoning by, adverse effect of and underdosing of predominantly beta-adrenoreceptor agonistsT44.6Poisoning by, adverse effect of and underdosing of alpha-adrenoreceptor antagonistsT44.7Poisoning by, adverse effect of and underdosing of beta-adrenoreceptor antagonistsT44.9Poisoning by, adverse effect of and underdosing of other and unspecified drugs primarily affecting the autonomic nervous system

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Code Information

CodeT44.8
BillableNo — Header code
ParentT44
CategoryInjury, poisoning and certain other consequences of external causes (S00-T88)
Excludes10 rule(s)
Excludes22 note(s)
Child codes1

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)