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ICD-10-CM · FY 2026 APRIL UPDATE

T50.99

Poisoning by, adverse effect of and underdosing of other drugs, medicaments and biological substances

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
T50.991Poisoning by other drugs, medicaments and biological substances, accidental (unintentional)Category
T50.991APoisoning by other drugs, medicaments and biological substances, accidental (unintentional), initial encounterBillable
T50.991DPoisoning by other drugs, medicaments and biological substances, accidental (unintentional), subsequent encounterBillable
T50.991SPoisoning by other drugs, medicaments and biological substances, accidental (unintentional), sequelaBillable
T50.992Poisoning by other drugs, medicaments and biological substances, intentional self-harmCategory
T50.992APoisoning by other drugs, medicaments and biological substances, intentional self-harm, initial encounterBillable
T50.992DPoisoning by other drugs, medicaments and biological substances, intentional self-harm, subsequent encounterBillable
T50.992SPoisoning by other drugs, medicaments and biological substances, intentional self-harm, sequelaBillable
T50.993Poisoning by other drugs, medicaments and biological substances, assaultCategory
T50.993APoisoning by other drugs, medicaments and biological substances, assault, initial encounterBillable
T50.993DPoisoning by other drugs, medicaments and biological substances, assault, subsequent encounterBillable
T50.993SPoisoning by other drugs, medicaments and biological substances, assault, sequelaBillable
T50.994Poisoning by other drugs, medicaments and biological substances, undeterminedCategory
T50.994APoisoning by other drugs, medicaments and biological substances, undetermined, initial encounterBillable
T50.994DPoisoning by other drugs, medicaments and biological substances, undetermined, subsequent encounterBillable
T50.994SPoisoning by other drugs, medicaments and biological substances, undetermined, sequelaBillable
T50.995Adverse effect of other drugs, medicaments and biological substancesCategory
T50.995AAdverse effect of other drugs, medicaments and biological substances, initial encounterBillable
T50.995DAdverse effect of other drugs, medicaments and biological substances, subsequent encounterBillable
T50.995SAdverse effect of other drugs, medicaments and biological substances, sequelaBillable
T50.996Underdosing of other drugs, medicaments and biological substancesCategory
T50.996AUnderdosing of other drugs, medicaments and biological substances, initial encounterBillable
T50.996DUnderdosing of other drugs, medicaments and biological substances, subsequent encounterBillable
T50.996SUnderdosing of other drugs, medicaments and biological substances, 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.