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T65.854S ICD-10-CM Code: Toxic effect of medetomidine, undetermined, sequela

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

Code Set: New for FY2027 — not valid before October 1, 2026.

Code Overview

No additional overview provided for this record.

Official Tabular Instructional Notes

Sequencing, inclusion, and exclusion notes published for T65.854S in the official ICD-10-CM tabular list.

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).

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code to identify associated manifestations, such as: inherited from T65.85
  • bradycardia NOS (R00.1) inherited from T65.85
  • somnolence, stupor and coma (R40.-) inherited from T65.85
  • Use additional code(s): inherited from T65
  • for all associated manifestations of toxic effect, such as: respiratory conditions due to external agents (J60-J70) inherited from T65
  • personal history of foreign body fully removed (Z87.821) inherited from T65
  • to identify any retained foreign body, if applicable (Z18.-) inherited from T65

Associated Substances (1)

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

  • Medetomidine

Frequently Compared Codes

The official Excludes notes on T65.854S name these codes. Each comparison page covers when the two can — or must not — be reported together.

Change history

  • Upcoming · effective FY2027 — 2026-10-01
    Will be added to the code set
    Toxic effect of medetomidine, undetermined, sequela
    FY2027 changes

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

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

Related Codes

Same injury, other encounter phase

Same injury, coded at a different phase of treatment via the 7th character.

T65.854A — Toxic effect of medetomidine, undetermined, initial encounter Compare T65.854S vs T65.854A →, T65.854D — Toxic effect of medetomidine, undetermined, subsequent encounter

Contextual Map

Every relationship of T65.854S 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]
  • T51-T65 — Toxic effects of substances chiefly nonmedicinal as to source [Hierarchy]

Drugs & chemicals

  • Medetomidine — Medetomidine — Poisoning, Undetermined [Drug table]: “Medetomidine (Poisoning, Undetermined)”

Nearest codes (40)

  • T65 — Toxic effect of other and unspecified substances [Sibling]
  • T65.844 — Toxic effect of xylazine, undetermined [Sibling]
  • T65.844A — Toxic effect of xylazine, undetermined, initial encounter [Sibling]
  • T65.844D — Toxic effect of xylazine, undetermined, subsequent encounter [Sibling]
  • T65.844S — Toxic effect of xylazine, undetermined, sequela [Sibling]
  • T65.85 — Toxic effect of medetomidine [Sibling]
  • T65.851 — Toxic effect of medetomidine, accidental (unintentional) [Sibling]
  • T65.851A — Toxic effect of medetomidine, accidental (unintentional), initial encounter [Sibling]
  • and 32 more

Change history

  • FY2027 — Will be added to the code set [Change history]

Frequently Asked Questions (FAQ) & Clinical Guidance

Does T65.854S require a 7th character?

Yes. The appropriate 7th character is to be added to each code from category T65.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to T65.854S in its code family, with their registry titles.

  • T65.853D — Toxic effect of medetomidine, assault, subsequent encounter
  • T65.853S — Toxic effect of medetomidine, assault, sequela
  • T65.854 — Toxic effect of medetomidine, undetermined
  • T65.854A — Toxic effect of medetomidine, undetermined, initial encounter
  • T65.854D — Toxic effect of medetomidine, undetermined, subsequent encounter
  • T65.89 — Toxic effect of other specified substances
  • T65.891 — Toxic effect of other specified substances, accidental (unintentional)
  • T65.891A — Toxic effect of other specified substances, accidental (unintentional), initial encounter
  • T65.891D — Toxic effect of other specified substances, accidental (unintentional), subsequent encounter
  • T65.891S — Toxic effect of other specified substances, accidental (unintentional), sequela

View all codes in the T65 family