T65.851D: Toxic effect of medetomidine, accidental (unintentional), subsequent encounter

New code · FY2027

Billable: use this code on claims.

• New code, effective October 1, 2026 (FY2027). Before that, this condition was coded as T65.891D.

Code breakdown

Coding notes

Inclusion terms (from T65.851)

• Toxic effect of medetomidine NOS

Use additional code (from T65.85)

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

7th character (from T65)

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

7th characters (category T65)

• A initial encounter
• D subsequent encounter
• S sequela

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All FY2027 ICD-10-CM changes

ICD-10-CM codes and descriptions are from the CMS and NCHS code files. Coverage is from the CMS Medicare Coverage Database billing and coding articles.