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ICD-10/T40.721

T40.721 ICD-10-CM Code: Poisoning by synthetic cannabinoids, accidental (unintentional)

Billing Status: NO. This is a clinician non-billable / parent hierarchy grouping in the ICD-10-CM system.

Official Registry Overview & Definition

Poisoning by synthetic cannabinoids, accidental (unintentional) is a non-billable ICD-10-CM category code (T40.721). A more specific billable subcode must be selected for claims submission.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T40.721 in the official ICD-10-CM tabular list.

Includes

Conditions the official ICD-10-CM tabular list includes under this code.

  • adverse effect of correct substance properly administered
  • poisoning by overdose of substance
  • poisoning by wrong substance given or taken in error
  • underdosing by (inadvertently) (deliberately) taking less substance than prescribed or instructed

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Code First

Underlying conditions that must be sequenced before this code.

  • Code first, for adverse effects, the nature of the adverse effect, such as:
  • adverse effect NOS (T88.7)
  • aspirin gastritis (K29.-)
  • blood disorders (D56-D76)
  • contact dermatitis (L23-L25)
  • dermatitis due to substances taken internally (L27.-)
  • nephropathy (N14.0-N14.2)

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code(s) to specify:
  • manifestations of poisoning
  • underdosing or failure in dosage during medical and surgical care (Y63.6, Y63.8-Y63.9)
  • underdosing of medication regimen (Z91.12-, Z91.13-)

Change history

  • FY2022 — 2021-10-01
    Added to the code set
    Poisoning by synthetic cannabinoids, accidental (unintentional)
    FY2022 changes

Verify Before Coding

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim.

Contextual Map

Every relationship of T40.721 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

  • T40.72 — Poisoning by, adverse effect of and underdosing of synthetic cannabinoids [Hierarchy]

Referenced by Excludes2 notes

  • F12.2 — Cannabis dependence [Excludes2](via T40.7.-): “cannabis poisoning (T40.7-)”
  • T43 — Poisoning by, adverse effect of and underdosing of psychotropic drugs, not elsewhere classified [Excludes2](via T40.7.-): “psychodysleptics [hallucinogens] (T40.7-T40.9-)”

Nearest codes (40)

  • T40 — Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens] [Sibling]
  • T40.712A — Poisoning by cannabis, intentional self-harm, initial encounter [Sibling]
  • T40.712D — Poisoning by cannabis, intentional self-harm, subsequent encounter [Sibling]
  • T40.712S — Poisoning by cannabis, intentional self-harm, sequela [Sibling]
  • T40.713 — Poisoning by cannabis, assault [Sibling]
  • T40.713A — Poisoning by cannabis, assault, initial encounter [Sibling]
  • T40.713D — Poisoning by cannabis, assault, subsequent encounter [Sibling]
  • T40.713S — Poisoning by cannabis, assault, sequela [Sibling]
  • and 32 more

Change history

  • FY2022 — Added to the code set [Change history]

Referenced by Other Codes

Official ICD-10-CM tabular notes on other codes that name T40.721 or its code family.

2 Excludes2 notes across 2 chapters: F12.2 (via T40.7.-), T43 (via T40.7.-).

Frequently Asked Questions (FAQ) & Clinical Guidance

Can T40.721 be billed directly?

No. T40.721 (Poisoning by synthetic cannabinoids, accidental (unintentional)) is a non-billable ICD-10-CM category code. A more specific billable subcode must be selected based on clinical documentation.

Does T40.721 require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T40.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T40.721 in its code family, with their registry titles.

  • T40.716 — Underdosing of cannabis
  • T40.716A — Underdosing of cannabis, initial encounter
  • T40.716D — Underdosing of cannabis, subsequent encounter
  • T40.716S — Underdosing of cannabis, sequela
  • T40.72 — Poisoning by, adverse effect of and underdosing of synthetic cannabinoids
  • T40.721A — Poisoning by synthetic cannabinoids, accidental (unintentional), initial encounter
  • T40.721D — Poisoning by synthetic cannabinoids, accidental (unintentional), subsequent encounter
  • T40.721S — Poisoning by synthetic cannabinoids, accidental (unintentional), sequela
  • T40.722 — Poisoning by synthetic cannabinoids, intentional self-harm
  • T40.722A — Poisoning by synthetic cannabinoids, intentional self-harm, initial encounter

View all codes in the T40 family

Associated Substances (2)

Substances from the official ICD-10-CM Table of Drugs and Chemicals that map to this code.

  • Cannabinoids, synthetic
  • Synthetic cannabinoids