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ICD-10-CM · FY 2026 APRIL UPDATE

T43.3

Poisoning by, adverse effect of and underdosing of phenothiazine antipsychotics and neuroleptics

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
T43.3XPoisoning by, adverse effect of and underdosing of phenothiazine antipsychotics and neurolepticsCategory
T43.3X1Poisoning by phenothiazine antipsychotics and neuroleptics, accidental (unintentional)Category
T43.3X1APoisoning by phenothiazine antipsychotics and neuroleptics, accidental (unintentional), initial encounterBillable
T43.3X1DPoisoning by phenothiazine antipsychotics and neuroleptics, accidental (unintentional), subsequent encounterBillable
T43.3X1SPoisoning by phenothiazine antipsychotics and neuroleptics, accidental (unintentional), sequelaBillable
T43.3X2Poisoning by phenothiazine antipsychotics and neuroleptics, intentional self-harmCategory
T43.3X2APoisoning by phenothiazine antipsychotics and neuroleptics, intentional self-harm, initial encounterBillable
T43.3X2DPoisoning by phenothiazine antipsychotics and neuroleptics, intentional self-harm, subsequent encounterBillable
T43.3X2SPoisoning by phenothiazine antipsychotics and neuroleptics, intentional self-harm, sequelaBillable
T43.3X3Poisoning by phenothiazine antipsychotics and neuroleptics, assaultCategory
T43.3X3APoisoning by phenothiazine antipsychotics and neuroleptics, assault, initial encounterBillable
T43.3X3DPoisoning by phenothiazine antipsychotics and neuroleptics, assault, subsequent encounterBillable
T43.3X3SPoisoning by phenothiazine antipsychotics and neuroleptics, assault, sequelaBillable
T43.3X4Poisoning by phenothiazine antipsychotics and neuroleptics, undeterminedCategory
T43.3X4APoisoning by phenothiazine antipsychotics and neuroleptics, undetermined, initial encounterBillable
T43.3X4DPoisoning by phenothiazine antipsychotics and neuroleptics, undetermined, subsequent encounterBillable
T43.3X4SPoisoning by phenothiazine antipsychotics and neuroleptics, undetermined, sequelaBillable
T43.3X5Adverse effect of phenothiazine antipsychotics and neurolepticsCategory
T43.3X5AAdverse effect of phenothiazine antipsychotics and neuroleptics, initial encounterBillable
T43.3X5DAdverse effect of phenothiazine antipsychotics and neuroleptics, subsequent encounterBillable
T43.3X5SAdverse effect of phenothiazine antipsychotics and neuroleptics, sequelaBillable
T43.3X6Underdosing of phenothiazine antipsychotics and neurolepticsCategory
T43.3X6AUnderdosing of phenothiazine antipsychotics and neuroleptics, initial encounterBillable
T43.3X6DUnderdosing of phenothiazine antipsychotics and neuroleptics, subsequent encounterBillable
T43.3X6SUnderdosing of phenothiazine antipsychotics and neuroleptics, 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.