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ICD-10-CM · FY 2026 APRIL UPDATE

T48.9

Poisoning by, adverse effect of and underdosing of other and unspecified agents primarily acting on the respiratory system

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
T48.90Poisoning by, adverse effect of and underdosing of unspecified agents primarily acting on the respiratory systemCategory
T48.901Poisoning by unspecified agents primarily acting on the respiratory system, accidental (unintentional)Category
T48.901APoisoning by unspecified agents primarily acting on the respiratory system, accidental (unintentional), initial encounterBillable
T48.901DPoisoning by unspecified agents primarily acting on the respiratory system, accidental (unintentional), subsequent encounterBillable
T48.901SPoisoning by unspecified agents primarily acting on the respiratory system, accidental (unintentional), sequelaBillable
T48.902Poisoning by unspecified agents primarily acting on the respiratory system, intentional self-harmCategory
T48.902APoisoning by unspecified agents primarily acting on the respiratory system, intentional self-harm, initial encounterBillable
T48.902DPoisoning by unspecified agents primarily acting on the respiratory system, intentional self-harm, subsequent encounterBillable
T48.902SPoisoning by unspecified agents primarily acting on the respiratory system, intentional self-harm, sequelaBillable
T48.903Poisoning by unspecified agents primarily acting on the respiratory system, assaultCategory
T48.903APoisoning by unspecified agents primarily acting on the respiratory system, assault, initial encounterBillable
T48.903DPoisoning by unspecified agents primarily acting on the respiratory system, assault, subsequent encounterBillable
T48.903SPoisoning by unspecified agents primarily acting on the respiratory system, assault, sequelaBillable
T48.904Poisoning by unspecified agents primarily acting on the respiratory system, undeterminedCategory
T48.904APoisoning by unspecified agents primarily acting on the respiratory system, undetermined, initial encounterBillable
T48.904DPoisoning by unspecified agents primarily acting on the respiratory system, undetermined, subsequent encounterBillable
T48.904SPoisoning by unspecified agents primarily acting on the respiratory system, undetermined, sequelaBillable
T48.905Adverse effect of unspecified agents primarily acting on the respiratory systemCategory
T48.905AAdverse effect of unspecified agents primarily acting on the respiratory system, initial encounterBillable
T48.905DAdverse effect of unspecified agents primarily acting on the respiratory system, subsequent encounterBillable
T48.905SAdverse effect of unspecified agents primarily acting on the respiratory system, sequelaBillable
T48.906Underdosing of unspecified agents primarily acting on the respiratory systemCategory
T48.906AUnderdosing of unspecified agents primarily acting on the respiratory system, initial encounterBillable
T48.906DUnderdosing of unspecified agents primarily acting on the respiratory system, subsequent encounterBillable
T48.906SUnderdosing of unspecified agents primarily acting on the respiratory system, sequelaBillable
T48.99Poisoning by, adverse effect of and underdosing of other agents primarily acting on the respiratory systemCategory
T48.991Poisoning by other agents primarily acting on the respiratory system, accidental (unintentional)Category
T48.991APoisoning by other agents primarily acting on the respiratory system, accidental (unintentional), initial encounterBillable
T48.991DPoisoning by other agents primarily acting on the respiratory system, accidental (unintentional), subsequent encounterBillable
T48.991SPoisoning by other agents primarily acting on the respiratory system, 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.