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ICD-10-CM · FY 2026 APRIL UPDATE

T45.A

Poisoning by, adverse effect of and underdosing of immune checkpoint inhibitors and immunostimulant 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.AXPoisoning by, adverse effect of and underdosing of immune checkpoint inhibitors and immunostimulant drugsCategory
T45.AX1Poisoning by immune checkpoint inhibitors and immunostimulant drugs, accidental (unintentional)Category
T45.AX1APoisoning by immune checkpoint inhibitors and immunostimulant drugs, accidental (unintentional), initial encounterBillable
T45.AX1DPoisoning by immune checkpoint inhibitors and immunostimulant drugs, accidental (unintentional), subsequent encounterBillable
T45.AX1SPoisoning by immune checkpoint inhibitors and immunostimulant drugs, accidental (unintentional), sequelaBillable
T45.AX2Poisoning by immune checkpoint inhibitors and immunostimulant drugs, intentional self-harmCategory
T45.AX2APoisoning by immune checkpoint inhibitors and immunostimulant drugs, intentional self-harm, initial encounterBillable
T45.AX2DPoisoning by immune checkpoint inhibitors and immunostimulant drugs, intentional self-harm, subsequent encounterBillable
T45.AX2SPoisoning by immune checkpoint inhibitors and immunostimulant drugs, intentional self-harm, sequelaBillable
T45.AX3Poisoning by immune checkpoint inhibitors and immunostimulant drugs, assaultCategory
T45.AX3APoisoning by immune checkpoint inhibitors and immunostimulant drugs, assault, initial encounterBillable
T45.AX3DPoisoning by immune checkpoint inhibitors and immunostimulant drugs, assault, subsequent encounterBillable
T45.AX3SPoisoning by immune checkpoint inhibitors and immunostimulant drugs, assault, sequelaBillable
T45.AX4Poisoning by immune checkpoint inhibitors and immunostimulant drugs, undeterminedCategory
T45.AX4APoisoning by immune checkpoint inhibitors and immunostimulant drugs, undetermined, initial encounterBillable
T45.AX4DPoisoning by immune checkpoint inhibitors and immunostimulant drugs, undetermined, subsequent encounterBillable
T45.AX4SPoisoning by immune checkpoint inhibitors and immunostimulant drugs, undetermined, sequelaBillable
T45.AX5Adverse effect of immune checkpoint inhibitors and immunostimulant drugsCategory
T45.AX5AAdverse effect of immune checkpoint inhibitors and immunostimulant drugs, initial encounterBillable
T45.AX5DAdverse effect of immune checkpoint inhibitors and immunostimulant drugs, subsequent encounterBillable
T45.AX5SAdverse effect of immune checkpoint inhibitors and immunostimulant drugs, sequelaBillable
T45.AX6Underdosing of immune checkpoint inhibitors and immunostimulant drugsCategory
T45.AX6AUnderdosing of immune checkpoint inhibitors and immunostimulant drugs, initial encounterBillable
T45.AX6DUnderdosing of immune checkpoint inhibitors and immunostimulant drugs, subsequent encounterBillable
T45.AX6SUnderdosing of immune checkpoint inhibitors and immunostimulant 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.

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.