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ICD-10-CM · FY 2026 APRIL UPDATE

T42.8X

Poisoning by, adverse effect of and underdosing of antiparkinsonism drugs and other central muscle-tone depressants

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
T42.8X1Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, accidental (unintentional)Category
T42.8X1APoisoning by antiparkinsonism drugs and other central muscle-tone depressants, accidental (unintentional), initial encounterBillable
T42.8X1DPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, accidental (unintentional), subsequent encounterBillable
T42.8X1SPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, accidental (unintentional), sequelaBillable
T42.8X2Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harmCategory
T42.8X2APoisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harm, initial encounterBillable
T42.8X2DPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harm, subsequent encounterBillable
T42.8X2SPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, intentional self-harm, sequelaBillable
T42.8X3Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, assaultCategory
T42.8X3APoisoning by antiparkinsonism drugs and other central muscle-tone depressants, assault, initial encounterBillable
T42.8X3DPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, assault, subsequent encounterBillable
T42.8X3SPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, assault, sequelaBillable
T42.8X4Poisoning by antiparkinsonism drugs and other central muscle-tone depressants, undeterminedCategory
T42.8X4APoisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined, initial encounterBillable
T42.8X4DPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined, subsequent encounterBillable
T42.8X4SPoisoning by antiparkinsonism drugs and other central muscle-tone depressants, undetermined, sequelaBillable
T42.8X5Adverse effect of antiparkinsonism drugs and other central muscle-tone depressantsCategory
T42.8X5AAdverse effect of antiparkinsonism drugs and other central muscle-tone depressants, initial encounterBillable
T42.8X5DAdverse effect of antiparkinsonism drugs and other central muscle-tone depressants, subsequent encounterBillable
T42.8X5SAdverse effect of antiparkinsonism drugs and other central muscle-tone depressants, sequelaBillable
T42.8X6Underdosing of antiparkinsonism drugs and other central muscle-tone depressantsCategory
T42.8X6AUnderdosing of antiparkinsonism drugs and other central muscle-tone depressants, initial encounterBillable
T42.8X6DUnderdosing of antiparkinsonism drugs and other central muscle-tone depressants, subsequent encounterBillable
T42.8X6SUnderdosing of antiparkinsonism drugs and other central muscle-tone depressants, 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.