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ICD-10/T40.716A

T40.716A ICD-10-CM Code: Underdosing of cannabis, initial encounter

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Inpatient Payment Groups (MS-DRG)

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v43.0, Appendix B.

  • MS-DRG 951 — OTHER FACTORS INFLUENCING HEALTH STATUS (MDC 23)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Official Registry Overview & Definition

Underdosing of cannabis, initial encounter is a billable ICD-10-CM diagnosis code (T40.716A).

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T40.716A 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
    Underdosing of cannabis, initial encounter
    FY2022 changes

Verify Before Coding

  • Billable — reportable as written.
  • Principal-diagnosis restriction. The Medicare Code Editor lists this code as unacceptable as a principal diagnosis: it describes a circumstance influencing health status rather than a current illness or injury being treated. It is valid as a secondary diagnosis.

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 T40.716A 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

  • S00-T88 — Chapter 19: Injury, Poisoning and Certain Other Consequences of External Causes (S00-T88) (S00-T88) [Hierarchy]
  • T36-T50 — Poisoning by, adverse effects of and underdosing of drugs, medicaments and biological substances [Hierarchy]
  • T40-T41 — Analgesics & Antipyretics [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-)”

Clinical classification (CCSR)

  • INJ029 — Underdosing of drugs and medicaments, initial encounter [CCSR]

Potential MS-DRG

  • DRG 951 — OTHER FACTORS INFLUENCING HEALTH STATUS [MS-DRG]: “OTHER FACTORS INFLUENCING HEALTH STATUS (MDC 23)”

Drugs & chemicals (14)

  • Afghanistan black — Afghanistan black — Underdosing [Drug table]: “Afghanistan black (Underdosing)”
  • Bhang+C394 — Bhang+C394 — Underdosing [Drug table]: “Bhang+C394 (Underdosing)”
  • Cannabinol — Cannabinol — Underdosing [Drug table]: “Cannabinol (Underdosing)”
  • Cannabis (derivatives) — Cannabis (derivatives) — Underdosing [Drug table]: “Cannabis (derivatives) (Underdosing)”
  • Dronabinol — Dronabinol — Underdosing [Drug table]: “Dronabinol (Underdosing)”
  • Ganja — Ganja — Underdosing [Drug table]: “Ganja (Underdosing)”
  • Hashish — Hashish — Underdosing [Drug table]: “Hashish (Underdosing)”
  • Lebanese red — Lebanese red — Underdosing [Drug table]: “Lebanese red (Underdosing)”
  • and 6 more

Nearest codes (40)

  • T40 — Poisoning by, adverse effect of and underdosing of narcotics and psychodysleptics [hallucinogens] [Sibling]
  • T40.711A — Poisoning by cannabis, accidental (unintentional), initial encounter [Sibling]
  • T40.711D — Poisoning by cannabis, accidental (unintentional), subsequent encounter [Sibling]
  • T40.711S — Poisoning by cannabis, accidental (unintentional), sequela [Sibling]
  • T40.712 — Poisoning by cannabis, intentional self-harm [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]
  • and 32 more

Change history

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

Referenced by Other Codes

Clinical classification (AHRQ CCSR):INJ029 — Underdosing of drugs and medicaments, initial encounter.

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Potential MS-DRG Relationships (FY2026)

Not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity.

Named in the grouper logic of 1 MS-DRG: DRG 951 (MDC 23).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Official ICD-10-CM tabular notes on other codes that name T40.716A 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

Does T40.716A 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 T40.716A in its code family, with their registry titles.

  • T40.715 — Adverse effect of cannabis
  • T40.715A — Adverse effect of cannabis, initial encounter
  • T40.715D — Adverse effect of cannabis, subsequent encounter
  • T40.715S — Adverse effect of cannabis, sequela
  • T40.716 — Underdosing of cannabis
  • 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
  • T40.721 — Poisoning by synthetic cannabinoids, accidental (unintentional)
  • T40.721A — Poisoning by synthetic cannabinoids, accidental (unintentional), initial encounter

View all codes in the T40 family

Associated Substances (14)

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

  • Afghanistan black
  • Bhang+C394
  • Cannabinol
  • Cannabis (derivatives)
  • Dronabinol
  • Ganja
  • Hashish
  • Lebanese red
  • Marihuana
  • Marijuana
  • Nabilone
  • Pot
  • Tetrahydrocannabinol
  • THC