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ICD-10-CM · FY 2026 APRIL UPDATE

T50.A

Poisoning by, adverse effect of and underdosing of bacterial vaccines

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
T50.A1Poisoning by, adverse effect of and underdosing of pertussis vaccine, including combinations with a pertussis componentCategory
T50.A11Poisoning by pertussis vaccine, including combinations with a pertussis component, accidental (unintentional)Category
T50.A11APoisoning by pertussis vaccine, including combinations with a pertussis component, accidental (unintentional), initial encounterBillable
T50.A11DPoisoning by pertussis vaccine, including combinations with a pertussis component, accidental (unintentional), subsequent encounterBillable
T50.A11SPoisoning by pertussis vaccine, including combinations with a pertussis component, accidental (unintentional), sequelaBillable
T50.A12Poisoning by pertussis vaccine, including combinations with a pertussis component, intentional self-harmCategory
T50.A12APoisoning by pertussis vaccine, including combinations with a pertussis component, intentional self-harm, initial encounterBillable
T50.A12DPoisoning by pertussis vaccine, including combinations with a pertussis component, intentional self-harm, subsequent encounterBillable
T50.A12SPoisoning by pertussis vaccine, including combinations with a pertussis component, intentional self-harm, sequelaBillable
T50.A13Poisoning by pertussis vaccine, including combinations with a pertussis component, assaultCategory
T50.A13APoisoning by pertussis vaccine, including combinations with a pertussis component, assault, initial encounterBillable
T50.A13DPoisoning by pertussis vaccine, including combinations with a pertussis component, assault, subsequent encounterBillable
T50.A13SPoisoning by pertussis vaccine, including combinations with a pertussis component, assault, sequelaBillable
T50.A14Poisoning by pertussis vaccine, including combinations with a pertussis component, undeterminedCategory
T50.A14APoisoning by pertussis vaccine, including combinations with a pertussis component, undetermined, initial encounterBillable
T50.A14DPoisoning by pertussis vaccine, including combinations with a pertussis component, undetermined, subsequent encounterBillable
T50.A14SPoisoning by pertussis vaccine, including combinations with a pertussis component, undetermined, sequelaBillable
T50.A15Adverse effect of pertussis vaccine, including combinations with a pertussis componentCategory
T50.A15AAdverse effect of pertussis vaccine, including combinations with a pertussis component, initial encounterBillable
T50.A15DAdverse effect of pertussis vaccine, including combinations with a pertussis component, subsequent encounterBillable
T50.A15SAdverse effect of pertussis vaccine, including combinations with a pertussis component, sequelaBillable
T50.A16Underdosing of pertussis vaccine, including combinations with a pertussis componentCategory
T50.A16AUnderdosing of pertussis vaccine, including combinations with a pertussis component, initial encounterBillable
T50.A16DUnderdosing of pertussis vaccine, including combinations with a pertussis component, subsequent encounterBillable
T50.A16SUnderdosing of pertussis vaccine, including combinations with a pertussis component, sequelaBillable
T50.A2Poisoning by, adverse effect of and underdosing of mixed bacterial vaccines without a pertussis componentCategory
T50.A21Poisoning by mixed bacterial vaccines without a pertussis component, accidental (unintentional)Category
T50.A21APoisoning by mixed bacterial vaccines without a pertussis component, accidental (unintentional), initial encounterBillable
T50.A21DPoisoning by mixed bacterial vaccines without a pertussis component, accidental (unintentional), subsequent encounterBillable
T50.A21SPoisoning by mixed bacterial vaccines without a pertussis component, accidental (unintentional), 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.