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ICD-10-CM · FY 2026 APRIL UPDATE

T45.9

Poisoning by, adverse effect of and underdosing of unspecified primarily systemic and hematological agent

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
T45.91Poisoning by unspecified primarily systemic and hematological agent, accidental (unintentional)Category
T45.91XAPoisoning by unspecified primarily systemic and hematological agent, accidental (unintentional), initial encounterBillable
T45.91XDPoisoning by unspecified primarily systemic and hematological agent, accidental (unintentional), subsequent encounterBillable
T45.91XSPoisoning by unspecified primarily systemic and hematological agent, accidental (unintentional), sequelaBillable
T45.92Poisoning by unspecified primarily systemic and hematological agent, intentional self-harmCategory
T45.92XAPoisoning by unspecified primarily systemic and hematological agent, intentional self-harm, initial encounterBillable
T45.92XDPoisoning by unspecified primarily systemic and hematological agent, intentional self-harm, subsequent encounterBillable
T45.92XSPoisoning by unspecified primarily systemic and hematological agent, intentional self-harm, sequelaBillable
T45.93Poisoning by unspecified primarily systemic and hematological agent, assaultCategory
T45.93XAPoisoning by unspecified primarily systemic and hematological agent, assault, initial encounterBillable
T45.93XDPoisoning by unspecified primarily systemic and hematological agent, assault, subsequent encounterBillable
T45.93XSPoisoning by unspecified primarily systemic and hematological agent, assault, sequelaBillable
T45.94Poisoning by unspecified primarily systemic and hematological agent, undeterminedCategory
T45.94XAPoisoning by unspecified primarily systemic and hematological agent, undetermined, initial encounterBillable
T45.94XDPoisoning by unspecified primarily systemic and hematological agent, undetermined, subsequent encounterBillable
T45.94XSPoisoning by unspecified primarily systemic and hematological agent, undetermined, sequelaBillable
T45.95Adverse effect of unspecified primarily systemic and hematological agentCategory
T45.95XAAdverse effect of unspecified primarily systemic and hematological agent, initial encounterBillable
T45.95XDAdverse effect of unspecified primarily systemic and hematological agent, subsequent encounterBillable
T45.95XSAdverse effect of unspecified primarily systemic and hematological agent, sequelaBillable
T45.96Underdosing of unspecified primarily systemic and hematological agentCategory
T45.96XAUnderdosing of unspecified primarily systemic and hematological agent, initial encounterBillable
T45.96XDUnderdosing of unspecified primarily systemic and hematological agent, subsequent encounterBillable
T45.96XSUnderdosing of unspecified primarily systemic and hematological agent, 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.