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ICD-10-CM · FY 2026 APRIL UPDATE

T40.0

Poisoning by, adverse effect of and underdosing of opium

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
T40.0XPoisoning by, adverse effect of and underdosing of opiumCategory
T40.0X1Poisoning by opium, accidental (unintentional)Category
T40.0X1APoisoning by opium, accidental (unintentional), initial encounterBillable
T40.0X1DPoisoning by opium, accidental (unintentional), subsequent encounterBillable
T40.0X1SPoisoning by opium, accidental (unintentional), sequelaBillable
T40.0X2Poisoning by opium, intentional self-harmCategory
T40.0X2APoisoning by opium, intentional self-harm, initial encounterBillable
T40.0X2DPoisoning by opium, intentional self-harm, subsequent encounterBillable
T40.0X2SPoisoning by opium, intentional self-harm, sequelaBillable
T40.0X3Poisoning by opium, assaultCategory
T40.0X3APoisoning by opium, assault, initial encounterBillable
T40.0X3DPoisoning by opium, assault, subsequent encounterBillable
T40.0X3SPoisoning by opium, assault, sequelaBillable
T40.0X4Poisoning by opium, undeterminedCategory
T40.0X4APoisoning by opium, undetermined, initial encounterBillable
T40.0X4DPoisoning by opium, undetermined, subsequent encounterBillable
T40.0X4SPoisoning by opium, undetermined, sequelaBillable
T40.0X5Adverse effect of opiumCategory
T40.0X5AAdverse effect of opium, initial encounterBillable
T40.0X5DAdverse effect of opium, subsequent encounterBillable
T40.0X5SAdverse effect of opium, sequelaBillable
T40.0X6Underdosing of opiumCategory
T40.0X6AUnderdosing of opium, initial encounterBillable
T40.0X6DUnderdosing of opium, subsequent encounterBillable
T40.0X6SUnderdosing of opium, 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.