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    OpenPayerBilling CodesPoisoning by, adverse effects of and underdosing of drugs, medicaments and biological substancesICD-10-CM t36-poisoning-by-systemic-antibiotics
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    ICD-10-CM Code For Poisoning By, Adverse Effect Of And Underdosing Of Systemic Antibiotics: Group Overview

    The International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) code group T36 includes diagnoses for poisoning by systemic antibiotics, adverse effects from therapeutic use of systemic antibacterial agents, and underdosing of systemic antibiotics that result in treatment failure or complications. These ICD-10-CM diagnosis codes are used to document scenarios such as accidental or intentional overdoses, drug-related allergic or toxic reactions, and insufficient dosing leading to persistent infection or treatment complications, capturing severity and organ system involvement as applicable. Accurate coding within the ICD-10-CM T36 group supports proper claim adjudication, complete clinical documentation, and appropriate reimbursement.

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    ICD-10-CM T36: Poisoning By, Adverse Effect Of And Underdosing Of Systemic Antibiotics Overview

    The diagnoses in this group represent poisonings, adverse effects, and underdosing related to systemic antibiotic agents that affect multiple organ systems depending on toxicity and allergic or dose-related reactions. These codes apply to situations involving therapeutic complications, accidental or intentional overdoses, and insufficient dosing of systemic antibacterial medications. Accurate coding is important for reflecting clinical complexity and supporting appropriate reimbursement and claims processing.

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    When to Use

    Use a code from this group when a patient presents with documented poisoning, adverse effect, or underdosing of a systemic antibiotic that requires clinical attention and is supported by the medical record. Select codes that specify the antibiotic class, intent (accidental, intentional self-harm, assault, or undetermined), and encounter type to accurately reflect the clinical scenario.

    ICD-10-CM Codes

    198 rows

    ICD-10-CM CodeDescription
    T36.0X1APoisoning by penicillins, accidental (unintentional), initial encounter
    T36.0X1DPoisoning by penicillins, accidental (unintentional), subsequent encounter
    T36.0X1SPoisoning by penicillins, accidental (unintentional), sequela
    T36.0X2APoisoning by penicillins, intentional self-harm, initial encounter
    T36.0X2DPoisoning by penicillins, intentional self-harm, subsequent encounter
    T36.0X2SPoisoning by penicillins, intentional self-harm, sequela
    T36.0X3APoisoning by penicillins, assault, initial encounter
    T36.0X3DPoisoning by penicillins, assault, subsequent encounter
    T36.0X3SPoisoning by penicillins, assault, sequela
    T36.0X4APoisoning by penicillins, undetermined, initial encounter
    T36.0X4DPoisoning by penicillins, undetermined, subsequent encounter
    T36.0X4SPoisoning by penicillins, undetermined, sequela
    T36.0X5AAdverse effect of penicillins, initial encounter
    T36.0X5DAdverse effect of penicillins, subsequent encounter
    T36.0X5SAdverse effect of penicillins, sequela
    T36.0X6AUnderdosing of penicillins, initial encounter
    T36.0X6DUnderdosing of penicillins, subsequent encounter
    T36.0X6SUnderdosing of penicillins, sequela
    T36.1X1APoisoning by cephalosporins and other beta-lactam antibiotics, accidental (unintentional), initial encounter
    T36.1X1DPoisoning by cephalosporins and other beta-lactam antibiotics, accidental (unintentional), subsequent encounter

    Showing 1–20 of 198

    • More pages

    DRG Codes

    9 rows

    DRG CodeDescription
    791Prematurity with Major Problems
    793Full Term Neonate with Major Problems
    917Poisoning and Toxic Effects of Drugs with MCC
    918Poisoning and Toxic Effects of Drugs without MCC
    922Other Injury, Poisoning and Toxic Effect Diagnoses with MCC
    923Other Injury, Poisoning and Toxic Effect Diagnoses without MCC
    949Aftercare with CC/MCC
    950Aftercare without CC/MCC
    951Other Factors Influencing Health Status

    Typical Clinical Scenarios

    • An adult presents to the emergency department with sudden onset nausea, vomiting, diarrhea, hypotension and altered mental status after accidentally ingesting a large quantity of an oral aminoglycoside prescribed for a household contact. The ED team documents acute toxic effects from intentional or accidental overdose of a systemic antibiotic and provides stabilization and decontamination as indicated; a poisoning code from this group is assigned to reflect the acute ingestion and toxicity. Typical codes: T36.2X1A, T36.2X3A
    • An elderly patient in a nursing facility develops progressive renal impairment and new-onset hearing loss after several weeks on a scheduled intravenous antibiotic regimen; the attending documents adverse effects attributed to therapeutic use of the systemic antibiotic. Because the presentation represents an adverse effect occurring during correct administration of the drug (not an overdose), a code from this group is used to capture the drug-related adverse effect as a comorbidity affecting ongoing care. Typical codes: T36.2X5A, T36.2X6D
    • A pediatric patient is brought to clinic because caregivers missed multiple doses of a systemic antibiotic for a recent streptococcal infection, and the child now has recrudescent fever and spreading erythematous pharyngitis. The clinician documents underdosing of the prescribed systemic antibiotic leading to treatment failure and schedules a revised therapy; an underdosing code from this group is assigned to indicate insufficient therapeutic dosing contributed to the current infection. Typical codes: T36.2X2A, T36.2X4A

    Related Codes

    T37-OTHER-SYSTEMIC-ANTI-INFECTIVES

    ICD-10-CM Code For Poisoning By Other Systemic Anti Infectives And Antiparasitics: Group Overview

    T38-HORMONE-POISONING-AND-UNDERDOSING

    ICD-10-CM Code For Poisoning By Adverse Effect And Underdosing Of Hormones And Their Synthetic Substitutes And Antagonists Not Elsewhere Classified: Group Overview

    T39-NONOPIOID-ANALGESIC-POISONING

    ICD-10-CM Code For Poisoning By Nonopioid Analgesics Antipyretics And Antirheumatics: Group Overview

    T40-POISONING-BY-NARCOTICS-AND-HALLUCINOGENS

    ICD-10-CM Code For Poisoning By Narcotics And Psychodysleptics: Group Overview

    T41-ANESTHETICS-AND-THERAPEUTIC-GASES

    ICD-10-CM Code For Poisoning By Adverse Effect Of And Underdosing Of Anesthetics And Therapeutic Gases: Group Overview

    T42-ANTIEPILEPTIC-SEDATIVE-HYPNOTIC-ANTIPARKINSONISM-DRUGS

    ICD-10-CM Code For Poisoning By Antiepileptic Sedative Hypnotic And Antiparkinsonism Drugs: Group Overview

    T43-POISONING-AND-ADVERSE-EFFECTS-PSYCHOTROPIC

    ICD-10-CM Code For Poisoning By Adverse Effect Of And Underdosing Of Psychotropic Drugs Not Elsewhere Classified: Group Overview

    T44-AUTONOMIC-NERVOUS-SYSTEM-DRUG-EVENTS

    ICD-10-CM Code For Poisoning By Adverse Effect Of And Underdosing Of Drugs Primarily Affecting The Autonomic Nervous System: Group Overview

    T45-PRIMARILY-SYSTEMIC-AND-HEMATOLOGICAL-AGENTS

    ICD-10-CM Code For Poisoning By Adverse Effect And Underdosing Of Primarily Systemic And Hematological Agents Not Elsewhere Classified: Group Overview

    T46-POISONING-CARDIOVASCULAR-AGENTS

    ICD-10-CM Code For Poisoning By Adverse Effect Of And Underdosing Of Agents Primarily Affecting The Cardiovascular System: Group Overview

    Showing 1–10 of 14

    Frequently Asked Questions

    References

    1. 1.CPT® Codes and Descriptions. AAPC. Retrieved Aug 11, 2026.Maintains the CPT code set's official descriptions and guidelines, licensed from the American Medical Association, used as the definitional source for CPT codes on this page.
    2. 2.HCPCS Quarterly Update. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's quarterly release of HCPCS Level II codes and short/long descriptors, the source for HCPCS code definitions and update history.
    3. 3.ICD-10-CM Full Code List. Centers for Medicare & Medicaid Services (CMS). Retrieved Aug 11, 2026.CMS's complete ICD-10-CM diagnosis code list, used to cross-reference diagnosis codes associated with this procedure or service.
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