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ICD-10-CM · FY 2026 APRIL UPDATE

T40.49

Poisoning by, adverse effect of and underdosing of other synthetic narcotics

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
T40.491Poisoning by other synthetic narcotics, accidental (unintentional)Category
T40.491APoisoning by other synthetic narcotics, accidental (unintentional), initial encounterBillable
T40.491DPoisoning by other synthetic narcotics, accidental (unintentional), subsequent encounterBillable
T40.491SPoisoning by other synthetic narcotics, accidental (unintentional), sequelaBillable
T40.492Poisoning by other synthetic narcotics, intentional self-harmCategory
T40.492APoisoning by other synthetic narcotics, intentional self-harm, initial encounterBillable
T40.492DPoisoning by other synthetic narcotics, intentional self-harm, subsequent encounterBillable
T40.492SPoisoning by other synthetic narcotics, intentional self-harm, sequelaBillable
T40.493Poisoning by other synthetic narcotics, assaultCategory
T40.493APoisoning by other synthetic narcotics, assault, initial encounterBillable
T40.493DPoisoning by other synthetic narcotics, assault, subsequent encounterBillable
T40.493SPoisoning by other synthetic narcotics, assault, sequelaBillable
T40.494Poisoning by other synthetic narcotics, undeterminedCategory
T40.494APoisoning by other synthetic narcotics, undetermined, initial encounterBillable
T40.494DPoisoning by other synthetic narcotics, undetermined, subsequent encounterBillable
T40.494SPoisoning by other synthetic narcotics, undetermined, sequelaBillable
T40.495Adverse effect of other synthetic narcoticsCategory
T40.495AAdverse effect of other synthetic narcotics, initial encounterBillable
T40.495DAdverse effect of other synthetic narcotics, subsequent encounterBillable
T40.495SAdverse effect of other synthetic narcotics, sequelaBillable
T40.496Underdosing of other synthetic narcoticsCategory
T40.496AUnderdosing of other synthetic narcotics, initial encounterBillable
T40.496DUnderdosing of other synthetic narcotics, subsequent encounterBillable
T40.496SUnderdosing of other synthetic narcotics, 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.