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ICD-10-CM 2027

ICD-10 code for toxic

T65.91

Toxic effect of unspecified substance, accidental (unintentional)

Header — needs a more specific code

From the official ICD-10-CM alphabetic index entry “Toxic (poisoning)”. Page updated September 29, 2026.

About coding toxic

The ICD-10-CM code for toxic is T65.91 (Toxic effect of unspecified substance, accidental (unintentional)). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on T65.91.

Within T65.9 (toxic effect of unspecified substance), T65.91 is specifically for toxic effect of unspecified substance, accidental (unintentional). Related codes cover intentional self-harm (T65.92), assault (T65.93) and undetermined (T65.94).

Codes in this range require a 7th character: A for initial encounter, D for subsequent encounter and S for sequela. Use placeholder "X" characters to fill any empty positions before the 7th character.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

More specific toxic codes (official index)

  • effect
  • shock syndrome A48.3 — Toxic shock syndrome
  • thyroid (gland)

Common questions about toxic ICD-10 codes

What is the ICD-10 code for toxic?

T65.91 — Toxic effect of unspecified substance, accidental (unintentional) (a header code; report a more specific subcode). More specific codes apply when the documentation supports them: A48.3.

What is the ICD-10 code for shock syndrome toxic?

A48.3 — Toxic shock syndrome.

Is T65.91 billable?

No. T65.91 is a header code. Report one of its more specific subcodes instead.