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ICD-10-CM · FY 2026 APRIL UPDATE

T44.9

Poisoning by, adverse effect of and underdosing of other and unspecified drugs primarily affecting the autonomic nervous system

Diagnosis reference

Nonbillable category

This entry is a category or subcategory. Choose the appropriate billable descendant based on the clinical documentation.

Effective periodOctober 1, 2026–September 30, 2027
SourceCMS ICD-10-CM order file
ClassificationDiagnosis · clinical modification

Related entries

Up to 30 descendants in this category

CODEDESCRIPTIONTYPE
T44.90Poisoning by, adverse effect of and underdosing of unspecified drugs primarily affecting the autonomic nervous systemCategory
T44.901Poisoning by unspecified drugs primarily affecting the autonomic nervous system, accidental (unintentional)Category
T44.901APoisoning by unspecified drugs primarily affecting the autonomic nervous system, accidental (unintentional), initial encounterBillable
T44.901DPoisoning by unspecified drugs primarily affecting the autonomic nervous system, accidental (unintentional), subsequent encounterBillable
T44.901SPoisoning by unspecified drugs primarily affecting the autonomic nervous system, accidental (unintentional), sequelaBillable
T44.902Poisoning by unspecified drugs primarily affecting the autonomic nervous system, intentional self-harmCategory
T44.902APoisoning by unspecified drugs primarily affecting the autonomic nervous system, intentional self-harm, initial encounterBillable
T44.902DPoisoning by unspecified drugs primarily affecting the autonomic nervous system, intentional self-harm, subsequent encounterBillable
T44.902SPoisoning by unspecified drugs primarily affecting the autonomic nervous system, intentional self-harm, sequelaBillable
T44.903Poisoning by unspecified drugs primarily affecting the autonomic nervous system, assaultCategory
T44.903APoisoning by unspecified drugs primarily affecting the autonomic nervous system, assault, initial encounterBillable
T44.903DPoisoning by unspecified drugs primarily affecting the autonomic nervous system, assault, subsequent encounterBillable
T44.903SPoisoning by unspecified drugs primarily affecting the autonomic nervous system, assault, sequelaBillable
T44.904Poisoning by unspecified drugs primarily affecting the autonomic nervous system, undeterminedCategory
T44.904APoisoning by unspecified drugs primarily affecting the autonomic nervous system, undetermined, initial encounterBillable
T44.904DPoisoning by unspecified drugs primarily affecting the autonomic nervous system, undetermined, subsequent encounterBillable
T44.904SPoisoning by unspecified drugs primarily affecting the autonomic nervous system, undetermined, sequelaBillable
T44.905Adverse effect of unspecified drugs primarily affecting the autonomic nervous systemCategory
T44.905AAdverse effect of unspecified drugs primarily affecting the autonomic nervous system, initial encounterBillable
T44.905DAdverse effect of unspecified drugs primarily affecting the autonomic nervous system, subsequent encounterBillable
T44.905SAdverse effect of unspecified drugs primarily affecting the autonomic nervous system, sequelaBillable
T44.906Underdosing of unspecified drugs primarily affecting the autonomic nervous systemCategory
T44.906AUnderdosing of unspecified drugs primarily affecting the autonomic nervous system, initial encounterBillable
T44.906DUnderdosing of unspecified drugs primarily affecting the autonomic nervous system, subsequent encounterBillable
T44.906SUnderdosing of unspecified drugs primarily affecting the autonomic nervous system, sequelaBillable
T44.99Poisoning by, adverse effect of and underdosing of other drugs primarily affecting the autonomic nervous systemCategory
T44.991Poisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional)Category
T44.991APoisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional), initial encounterBillable
T44.991DPoisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional), subsequent encounterBillable
T44.991SPoisoning by other drug primarily affecting the autonomic nervous system, accidental (unintentional), sequelaBillable

Use the complete reference

This reference does not reproduce the full tabular hierarchy, inclusion notes, Excludes1/2 notes, sequencing instructions, or seventh-character rules. Review the official tables and coding guidelines.

Open official CMS files

ICD-10-CM codes describe diagnoses. They do not have an independent Medicare PFS reimbursement amount, and billability alone does not establish coverage.