T41.3X1A Poisoning by local anesthetics, accidental (unintentional), initial encounter

ICD-10-CM T41.3X1A: Poisoning by local anesthetics, accidental (unintentional), initial encounter

ICD-10-CM code T41.3X1A denotes an accidental and unintentional poisoning by local anesthetics during an initial encounter. Local anesthetics are drugs that reversibly block nerve impulses without affecting consciousness, and their accidental overdose may be fatal. This diagnostic label is distinct from subsequent encounters and intentional self-harm, serving to categorize the specific nature of the event. 2 3 4

Plain-language overview

Local anesthetics are drugs that reversibly block the transmission of a nerve impulse without affecting consciousness, and an accidental overdose of these substances may prove fatal. 2

What this code represents

ICD-10-CM code T41.3X1A represents poisoning by local anesthetics that is accidental or unintentional, specifically for an initial encounter. 3 4

Coding details

The code T41.3X1A is listed alongside T41.3X2A for intentional self-harm and T41.3X4A for undetermined intent, distinguishing the accidental nature of the poisoning. 3 4

Within a substance use disorder diagnosis list, T41.3X1A is categorized as an unintentional drug overdose, while T41.3X1D represents a subsequent encounter for the same accidental poisoning. 4

Clinical context

Systemic toxicity from a local anesthetic overdose occurs due to accidental intravascular injection, absorption from a tissue depot, or repeated doses without balanced elimination. 2

Clinical features of accidental pharmaceutical poisoning are the result of factors including the intrinsic properties of the toxin, the dose, the formulation, the mode of exposure, co-ingestion of other toxins, and the patient's prior health status. 1

Documentation considerations

A clinical guideline panel evaluated the management of pharmaceutical and recreational drug poisoning across eight fields, including severity assessment, diagnostic approach, supportive care, and decontamination. 1

What the sources add

Clinical literature details the pharmacology and severe risks of local anesthetic overdose, while payer and clinical reference sources provide the exact ICD-10-CM code label and its categorical distinctions. 1 2 3 4

A Centers for Medicare and Medicaid Services article lists T41.3X1A as a diagnostic label for accidental poisoning, whereas a separate clinical guideline describes the administration of intravenous lipid emulsion for patients with local anesthetic poisoning showing signs of severity. 1 3

Sources

1. Management of pharmaceutical and recreational drug poisoning — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
2. Lipid Emulsion for Local Anesthetic Systemic Toxicity — pmc.ncbi.nlm.nih.gov; accessed 2026-07-25.
3. Article - Billing and Coding: Oximetry Services (A57205) — cms.gov; accessed 2026-07-25.
4. Substance Use Disorder Diagnosis List — providerservices.iehp.org; accessed 2026-07-25.