T46.4X1A Poisoning by angiotensin-converting-enzyme inhibitors, accidental (unintentional), initial encounter

ICD-10-CM T46.4X1A: Poisoning by angiotensin-converting-enzyme inhibitors, accidental (unintentional), initial encounter

ICD-10-CM code T46.4X1A identifies poisoning by angiotensin-converting-enzyme inhibitors, accidental (unintentional), initial encounter. The diagnosis appears in official coding references and federal billing guidance. The available sources establish the code label and its placement in billing and coding contexts, but they do not provide detailed clinical symptoms, treatment protocols, or payer coverage rules. 2 3

What this code represents

The official display label for ICD-10-CM code T46.4X1A is Poisoning by angiotensin-converting-enzyme inhibitors, accidental (unintentional), initial encounter. The code is listed alongside T46.4X1D, which represents Poisoning by angiotensin-converting-enzyme inhibitors. 3

Coding details

Code T46.4X1A is a specific ICD-10-CM diagnosis code listed in the 2022 version of the code system. The code's full alphanumeric string includes the character A at the end of the base code T46.4X1. 3

Coverage and utilization context

The Centers for Medicare and Medicaid Services references the diagnosis of Poisoning by angiotensin-converting-enzyme inhibitors, accidental (unintentional), within an article that provides guidance for billing, coding, and other guidelines. 2

What the sources add

The VSAC source provides the formal code system structure and official label for T46.4X1A, while the CMS source places this exact diagnosis into an operational billing and coding guidance context. 2 3

Clinical context

A clinical guidance toolkit for identifying harm lists angiotensin-converting enzyme medications among agents considered during medical record reviews. The same toolkit also mentions laboratory tests for cardiac enzymes and echocardiogram results. 1

Plain-language overview

This diagnosis code applies to an accidental or unintentional poisoning involving angiotensin-converting-enzyme inhibitors. The official label includes the phrase initial encounter, distinguishing it from other listed codes in the same category. 3

Documentation considerations

Medical record documentation for this diagnosis involves identifying an accidental or unintentional poisoning by angiotensin-converting-enzyme inhibitors. The available sources do not specify the exact clinical elements needed to support this particular code. 2 3

Sources

1. Adverse Events Toolkit: Clinical Guidance for Identifying Harm — digirepo.nlm.nih.gov; accessed 2026-07-25.
2. Article - Billing and Coding: Transthoracic Echocardiography (TTE) (A57306) — cms.gov; accessed 2026-07-25.
3. Browse Code Systems — vsac.nlm.nih.gov; accessed 2026-07-25.