T40.605 (Adverse effect of unspecified narcotics) 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 adverse effect of unspecified narcotics for clinical documentation, billing and epidemiological tracking.

ICD-10-CM · Category

T40.605 - Adverse effect of unspecified narcotics

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

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Sub-codes under T40.605

T40.605AAdverse effect of unspecified narcotics, initial encounterT40.605DAdverse effect of unspecified narcotics, subs encntrT40.605SAdverse effect of unspecified narcotics, sequela

Related diagnoses

T40.601Poisoning by unsp narcotics, accidental (unintentional)T40.602Poisoning by unspecified narcotics, intentional self-harmT40.603Poisoning by unspecified narcotics, assaultT40.604Poisoning by unspecified narcotics, undeterminedT40.606Underdosing of unspecified narcotics

Common questions about T40.605 (Adverse effect of unspecified narcotics)

What does ICD-10 code T40.605 mean?
T40.605 is the ICD-10-CM 2025 code for Adverse effect of unspecified narcotics. 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 T40.605 a billable diagnosis code?
T40.605 is a category-level (umbrella) code rather than a billable specific code. For billing purposes, clinicians typically use a more specific sub-code under T40.605. Browse the sub-codes listed on this page.
Which ICD-10 chapter does T40.605 belong to?
T40.605 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 Adverse effect of unspecified narcotics?
For a plain-language explanation of Adverse effect of unspecified narcotics, ask GoDavaii's Health AI - it explains medical conditions in 90+ languages, free, with no signup. Tap "Ask GoDavaii AI about Adverse effect of unspecified narcotics" 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 ↗