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ICD-10-CM · FY 2026 APRIL UPDATE

T40.99

Poisoning by, adverse effect of and underdosing of other psychodysleptics [hallucinogens]

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
T40.991Poisoning by other psychodysleptics [hallucinogens], accidental (unintentional)Category
T40.991APoisoning by other psychodysleptics [hallucinogens], accidental (unintentional), initial encounterBillable
T40.991DPoisoning by other psychodysleptics [hallucinogens], accidental (unintentional), subsequent encounterBillable
T40.991SPoisoning by other psychodysleptics [hallucinogens], accidental (unintentional), sequelaBillable
T40.992Poisoning by other psychodysleptics [hallucinogens], intentional self-harmCategory
T40.992APoisoning by other psychodysleptics [hallucinogens], intentional self-harm, initial encounterBillable
T40.992DPoisoning by other psychodysleptics [hallucinogens], intentional self-harm, subsequent encounterBillable
T40.992SPoisoning by other psychodysleptics [hallucinogens], intentional self-harm, sequelaBillable
T40.993Poisoning by other psychodysleptics [hallucinogens], assaultCategory
T40.993APoisoning by other psychodysleptics [hallucinogens], assault, initial encounterBillable
T40.993DPoisoning by other psychodysleptics [hallucinogens], assault, subsequent encounterBillable
T40.993SPoisoning by other psychodysleptics [hallucinogens], assault, sequelaBillable
T40.994Poisoning by other psychodysleptics [hallucinogens], undeterminedCategory
T40.994APoisoning by other psychodysleptics [hallucinogens], undetermined, initial encounterBillable
T40.994DPoisoning by other psychodysleptics [hallucinogens], undetermined, subsequent encounterBillable
T40.994SPoisoning by other psychodysleptics [hallucinogens], undetermined, sequelaBillable
T40.995Adverse effect of other psychodysleptics [hallucinogens]Category
T40.995AAdverse effect of other psychodysleptics [hallucinogens], initial encounterBillable
T40.995DAdverse effect of other psychodysleptics [hallucinogens], subsequent encounterBillable
T40.995SAdverse effect of other psychodysleptics [hallucinogens], sequelaBillable
T40.996Underdosing of other psychodysleptics [hallucinogens]Category
T40.996AUnderdosing of other psychodysleptics [hallucinogens], initial encounterBillable
T40.996DUnderdosing of other psychodysleptics [hallucinogens], subsequent encounterBillable
T40.996SUnderdosing of other psychodysleptics [hallucinogens], 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.