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ICD-10-CM · FY 2026 APRIL UPDATE

T45.1

Poisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive drugs

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
T45.1XPoisoning by, adverse effect of and underdosing of antineoplastic and immunosuppressive drugsCategory
T45.1X1Poisoning by antineoplastic and immunosuppressive drugs, accidental (unintentional)Category
T45.1X1APoisoning by antineoplastic and immunosuppressive drugs, accidental (unintentional), initial encounterBillable
T45.1X1DPoisoning by antineoplastic and immunosuppressive drugs, accidental (unintentional), subsequent encounterBillable
T45.1X1SPoisoning by antineoplastic and immunosuppressive drugs, accidental (unintentional), sequelaBillable
T45.1X2Poisoning by antineoplastic and immunosuppressive drugs, intentional self-harmCategory
T45.1X2APoisoning by antineoplastic and immunosuppressive drugs, intentional self-harm, initial encounterBillable
T45.1X2DPoisoning by antineoplastic and immunosuppressive drugs, intentional self-harm, subsequent encounterBillable
T45.1X2SPoisoning by antineoplastic and immunosuppressive drugs, intentional self-harm, sequelaBillable
T45.1X3Poisoning by antineoplastic and immunosuppressive drugs, assaultCategory
T45.1X3APoisoning by antineoplastic and immunosuppressive drugs, assault, initial encounterBillable
T45.1X3DPoisoning by antineoplastic and immunosuppressive drugs, assault, subsequent encounterBillable
T45.1X3SPoisoning by antineoplastic and immunosuppressive drugs, assault, sequelaBillable
T45.1X4Poisoning by antineoplastic and immunosuppressive drugs, undeterminedCategory
T45.1X4APoisoning by antineoplastic and immunosuppressive drugs, undetermined, initial encounterBillable
T45.1X4DPoisoning by antineoplastic and immunosuppressive drugs, undetermined, subsequent encounterBillable
T45.1X4SPoisoning by antineoplastic and immunosuppressive drugs, undetermined, sequelaBillable
T45.1X5Adverse effect of antineoplastic and immunosuppressive drugsCategory
T45.1X5AAdverse effect of antineoplastic and immunosuppressive drugs, initial encounterBillable
T45.1X5DAdverse effect of antineoplastic and immunosuppressive drugs, subsequent encounterBillable
T45.1X5SAdverse effect of antineoplastic and immunosuppressive drugs, sequelaBillable
T45.1X6Underdosing of antineoplastic and immunosuppressive drugsCategory
T45.1X6AUnderdosing of antineoplastic and immunosuppressive drugs, initial encounterBillable
T45.1X6DUnderdosing of antineoplastic and immunosuppressive drugs, subsequent encounterBillable
T45.1X6SUnderdosing of antineoplastic and immunosuppressive drugs, 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.

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