T40.3X (Poisoning by, adverse effect of and underdosing of methadone) is an umbrella ICD-10-CM medical diagnosis code in the Injury, poisoning and certain other consequences of external causes chapter. It identifies cases of poisoning by, adverse effect of and underdosing of methadone for clinical documentation, billin

ICD-10-CM · Category

T40.3X - Poisoning by, adverse effect of and underdosing of methadone

Chapter S00-T88: Injury, poisoning and certain other consequences of external causes

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Sub-codes under T40.3X

T40.3X1Poisoning by methadone, accidental (unintentional)T40.3X2Poisoning by methadone, intentional self-harmT40.3X3Poisoning by methadone, assaultT40.3X4Poisoning by methadone, undeterminedT40.3X5Adverse effect of methadoneT40.3X6Underdosing of methadone

Common questions about T40.3X (Poisoning by, adverse effect of and underdosing of methadone)

What does ICD-10 code T40.3X mean?
T40.3X is the ICD-10-CM 2025 code for Poisoning by, adverse effect of and underdosing of methadone. ICD-10-CM is the medical coding system used by clinicians, hospitals and insurers in the United States to classify diseases and conditions in a standard way.
Is T40.3X a billable diagnosis code?
T40.3X is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under T40.3X. Browse the sub-codes listed on this page.
Which ICD-10 chapter does T40.3X belong to?
T40.3X belongs to the chapter "Injury, poisoning and certain other consequences of external causes" (codes S00-T88). ICD-10-CM organises codes into 22 chapters by body system or condition type, which helps clinicians navigate related diagnoses.
Where can I get plain-language information about Poisoning by, adverse effect of and underdosing of methadone?
For a plain-language explanation of Poisoning by, adverse effect of and underdosing of methadone, ask GoDavaii's Health AI - it explains medical conditions in 90+ languages, free, with no signup. Tap "Ask GoDavaii AI about Poisoning by, adverse effect of and underdosing of methadone" above to get a personalised answer.

Source: ICD-10-CM 2025 (Centers for Medicare & Medicaid Services, public domain). Codes valid from October 1, 2024. CMS source ↗