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ICD-10-CM 2027 diagnosis code

T65.85Toxic effect of medetomidine

Not billable — use a more specific codeNew for 2027Requires 7th character

T65.85 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it and add the required 7th character.

Code last changed in FY2027 (effective October 1, 2026). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About T65.85

T65.85 is the ICD-10-CM diagnosis code for toxic effect of medetomidine. It belongs to category T65 (toxic effect of other and unspecified substances), block T51-T65 (toxic effects of substances chiefly nonmedicinal as to source) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within T65.8 (toxic effect of other specified substances), T65.85 is specifically for toxic effect of medetomidine. Related codes cover latex (T65.81), harmful algae and algae toxins (T65.82), fiberglass (T65.83), xylazine (T65.84) and other specified substances (T65.89).

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.

Use an additional code to identify associated manifestations, such as: bradycardia NOS (R00.1) and somnolence, stupor and coma (R40.-).

It was added in FY2027, effective October 1, 2026.

7th character

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

  • Ainitial encounter
  • Dsubsequent encounter
  • Ssequela

Coding notes

Use additional codeAdd a secondary code to fully describe the condition
  • code to identify associated manifestations, such as:
  • bradycardia NOS (R00.1)
  • somnolence, stupor and coma (R40.-)

Notes that apply from higher levels

Instructions written at a parent level also apply to T65.85.

Broader instructions also apply from T51-T65 Toxic effects of substances chiefly nonmedicinal as to source and Chapter 19: Injury, poisoning and certain other consequences of external causes.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2027 (effective 10/1/2026): Added

Common questions about T65.85

Is T65.85 billable?

No. T65.85 is a header code. Report one of its more specific subcodes instead.

Did T65.85 change for 2027?

Yes. For FY2027 (effective October 1, 2026) it was added to the code set.